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Commit | Line | Data |
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b411b363 PR |
1 | /* |
2 | drbd_receiver.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
25 | ||
b411b363 PR |
26 | #include <linux/module.h> |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | #include <net/sock.h> | |
30 | ||
b411b363 PR |
31 | #include <linux/drbd.h> |
32 | #include <linux/fs.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/memcontrol.h> | |
37 | #include <linux/mm_inline.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/smp_lock.h> | |
40 | #include <linux/pkt_sched.h> | |
41 | #define __KERNEL_SYSCALLS__ | |
42 | #include <linux/unistd.h> | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/random.h> | |
b411b363 PR |
45 | #include <linux/string.h> |
46 | #include <linux/scatterlist.h> | |
47 | #include "drbd_int.h" | |
b411b363 PR |
48 | #include "drbd_req.h" |
49 | ||
50 | #include "drbd_vli.h" | |
51 | ||
b411b363 PR |
52 | enum finish_epoch { |
53 | FE_STILL_LIVE, | |
54 | FE_DESTROYED, | |
55 | FE_RECYCLED, | |
56 | }; | |
57 | ||
58 | static int drbd_do_handshake(struct drbd_conf *mdev); | |
59 | static int drbd_do_auth(struct drbd_conf *mdev); | |
60 | ||
61 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); | |
62 | static int e_end_block(struct drbd_conf *, struct drbd_work *, int); | |
63 | ||
b411b363 PR |
64 | |
65 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
66 | ||
45bb912b LE |
67 | /* |
68 | * some helper functions to deal with single linked page lists, | |
69 | * page->private being our "next" pointer. | |
70 | */ | |
71 | ||
72 | /* If at least n pages are linked at head, get n pages off. | |
73 | * Otherwise, don't modify head, and return NULL. | |
74 | * Locking is the responsibility of the caller. | |
75 | */ | |
76 | static struct page *page_chain_del(struct page **head, int n) | |
77 | { | |
78 | struct page *page; | |
79 | struct page *tmp; | |
80 | ||
81 | BUG_ON(!n); | |
82 | BUG_ON(!head); | |
83 | ||
84 | page = *head; | |
23ce4227 PR |
85 | |
86 | if (!page) | |
87 | return NULL; | |
88 | ||
45bb912b LE |
89 | while (page) { |
90 | tmp = page_chain_next(page); | |
91 | if (--n == 0) | |
92 | break; /* found sufficient pages */ | |
93 | if (tmp == NULL) | |
94 | /* insufficient pages, don't use any of them. */ | |
95 | return NULL; | |
96 | page = tmp; | |
97 | } | |
98 | ||
99 | /* add end of list marker for the returned list */ | |
100 | set_page_private(page, 0); | |
101 | /* actual return value, and adjustment of head */ | |
102 | page = *head; | |
103 | *head = tmp; | |
104 | return page; | |
105 | } | |
106 | ||
107 | /* may be used outside of locks to find the tail of a (usually short) | |
108 | * "private" page chain, before adding it back to a global chain head | |
109 | * with page_chain_add() under a spinlock. */ | |
110 | static struct page *page_chain_tail(struct page *page, int *len) | |
111 | { | |
112 | struct page *tmp; | |
113 | int i = 1; | |
114 | while ((tmp = page_chain_next(page))) | |
115 | ++i, page = tmp; | |
116 | if (len) | |
117 | *len = i; | |
118 | return page; | |
119 | } | |
120 | ||
121 | static int page_chain_free(struct page *page) | |
122 | { | |
123 | struct page *tmp; | |
124 | int i = 0; | |
125 | page_chain_for_each_safe(page, tmp) { | |
126 | put_page(page); | |
127 | ++i; | |
128 | } | |
129 | return i; | |
130 | } | |
131 | ||
132 | static void page_chain_add(struct page **head, | |
133 | struct page *chain_first, struct page *chain_last) | |
134 | { | |
135 | #if 1 | |
136 | struct page *tmp; | |
137 | tmp = page_chain_tail(chain_first, NULL); | |
138 | BUG_ON(tmp != chain_last); | |
139 | #endif | |
140 | ||
141 | /* add chain to head */ | |
142 | set_page_private(chain_last, (unsigned long)*head); | |
143 | *head = chain_first; | |
144 | } | |
145 | ||
146 | static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) | |
b411b363 PR |
147 | { |
148 | struct page *page = NULL; | |
45bb912b LE |
149 | struct page *tmp = NULL; |
150 | int i = 0; | |
b411b363 PR |
151 | |
152 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
153 | * So what. It saves a spin_lock. */ | |
45bb912b | 154 | if (drbd_pp_vacant >= number) { |
b411b363 | 155 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
156 | page = page_chain_del(&drbd_pp_pool, number); |
157 | if (page) | |
158 | drbd_pp_vacant -= number; | |
b411b363 | 159 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
160 | if (page) |
161 | return page; | |
b411b363 | 162 | } |
45bb912b | 163 | |
b411b363 PR |
164 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
165 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
166 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
167 | for (i = 0; i < number; i++) { |
168 | tmp = alloc_page(GFP_TRY); | |
169 | if (!tmp) | |
170 | break; | |
171 | set_page_private(tmp, (unsigned long)page); | |
172 | page = tmp; | |
173 | } | |
174 | ||
175 | if (i == number) | |
176 | return page; | |
177 | ||
178 | /* Not enough pages immediately available this time. | |
179 | * No need to jump around here, drbd_pp_alloc will retry this | |
180 | * function "soon". */ | |
181 | if (page) { | |
182 | tmp = page_chain_tail(page, NULL); | |
183 | spin_lock(&drbd_pp_lock); | |
184 | page_chain_add(&drbd_pp_pool, page, tmp); | |
185 | drbd_pp_vacant += i; | |
186 | spin_unlock(&drbd_pp_lock); | |
187 | } | |
188 | return NULL; | |
b411b363 PR |
189 | } |
190 | ||
191 | /* kick lower level device, if we have more than (arbitrary number) | |
192 | * reference counts on it, which typically are locally submitted io | |
193 | * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ | |
194 | static void maybe_kick_lo(struct drbd_conf *mdev) | |
195 | { | |
196 | if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) | |
197 | drbd_kick_lo(mdev); | |
198 | } | |
199 | ||
200 | static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) | |
201 | { | |
202 | struct drbd_epoch_entry *e; | |
203 | struct list_head *le, *tle; | |
204 | ||
205 | /* The EEs are always appended to the end of the list. Since | |
206 | they are sent in order over the wire, they have to finish | |
207 | in order. As soon as we see the first not finished we can | |
208 | stop to examine the list... */ | |
209 | ||
210 | list_for_each_safe(le, tle, &mdev->net_ee) { | |
211 | e = list_entry(le, struct drbd_epoch_entry, w.list); | |
45bb912b | 212 | if (drbd_ee_has_active_page(e)) |
b411b363 PR |
213 | break; |
214 | list_move(le, to_be_freed); | |
215 | } | |
216 | } | |
217 | ||
218 | static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) | |
219 | { | |
220 | LIST_HEAD(reclaimed); | |
221 | struct drbd_epoch_entry *e, *t; | |
222 | ||
223 | maybe_kick_lo(mdev); | |
224 | spin_lock_irq(&mdev->req_lock); | |
225 | reclaim_net_ee(mdev, &reclaimed); | |
226 | spin_unlock_irq(&mdev->req_lock); | |
227 | ||
228 | list_for_each_entry_safe(e, t, &reclaimed, w.list) | |
435f0740 | 229 | drbd_free_net_ee(mdev, e); |
b411b363 PR |
230 | } |
231 | ||
232 | /** | |
45bb912b | 233 | * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) |
b411b363 | 234 | * @mdev: DRBD device. |
45bb912b LE |
235 | * @number: number of pages requested |
236 | * @retry: whether to retry, if not enough pages are available right now | |
237 | * | |
238 | * Tries to allocate number pages, first from our own page pool, then from | |
239 | * the kernel, unless this allocation would exceed the max_buffers setting. | |
240 | * Possibly retry until DRBD frees sufficient pages somewhere else. | |
b411b363 | 241 | * |
45bb912b | 242 | * Returns a page chain linked via page->private. |
b411b363 | 243 | */ |
45bb912b | 244 | static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) |
b411b363 PR |
245 | { |
246 | struct page *page = NULL; | |
247 | DEFINE_WAIT(wait); | |
248 | ||
45bb912b LE |
249 | /* Yes, we may run up to @number over max_buffers. If we |
250 | * follow it strictly, the admin will get it wrong anyways. */ | |
251 | if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) | |
252 | page = drbd_pp_first_pages_or_try_alloc(mdev, number); | |
b411b363 | 253 | |
45bb912b | 254 | while (page == NULL) { |
b411b363 PR |
255 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
256 | ||
257 | drbd_kick_lo_and_reclaim_net(mdev); | |
258 | ||
259 | if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { | |
45bb912b | 260 | page = drbd_pp_first_pages_or_try_alloc(mdev, number); |
b411b363 PR |
261 | if (page) |
262 | break; | |
263 | } | |
264 | ||
265 | if (!retry) | |
266 | break; | |
267 | ||
268 | if (signal_pending(current)) { | |
269 | dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); | |
270 | break; | |
271 | } | |
272 | ||
273 | schedule(); | |
274 | } | |
275 | finish_wait(&drbd_pp_wait, &wait); | |
276 | ||
45bb912b LE |
277 | if (page) |
278 | atomic_add(number, &mdev->pp_in_use); | |
b411b363 PR |
279 | return page; |
280 | } | |
281 | ||
282 | /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. | |
45bb912b LE |
283 | * Is also used from inside an other spin_lock_irq(&mdev->req_lock); |
284 | * Either links the page chain back to the global pool, | |
285 | * or returns all pages to the system. */ | |
435f0740 | 286 | static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net) |
b411b363 | 287 | { |
435f0740 | 288 | atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; |
b411b363 | 289 | int i; |
435f0740 | 290 | |
45bb912b LE |
291 | if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) |
292 | i = page_chain_free(page); | |
293 | else { | |
294 | struct page *tmp; | |
295 | tmp = page_chain_tail(page, &i); | |
296 | spin_lock(&drbd_pp_lock); | |
297 | page_chain_add(&drbd_pp_pool, page, tmp); | |
298 | drbd_pp_vacant += i; | |
299 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 300 | } |
435f0740 | 301 | i = atomic_sub_return(i, a); |
45bb912b | 302 | if (i < 0) |
435f0740 LE |
303 | dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", |
304 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); | |
b411b363 PR |
305 | wake_up(&drbd_pp_wait); |
306 | } | |
307 | ||
308 | /* | |
309 | You need to hold the req_lock: | |
310 | _drbd_wait_ee_list_empty() | |
311 | ||
312 | You must not have the req_lock: | |
313 | drbd_free_ee() | |
314 | drbd_alloc_ee() | |
315 | drbd_init_ee() | |
316 | drbd_release_ee() | |
317 | drbd_ee_fix_bhs() | |
318 | drbd_process_done_ee() | |
319 | drbd_clear_done_ee() | |
320 | drbd_wait_ee_list_empty() | |
321 | */ | |
322 | ||
323 | struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, | |
324 | u64 id, | |
325 | sector_t sector, | |
326 | unsigned int data_size, | |
327 | gfp_t gfp_mask) __must_hold(local) | |
328 | { | |
b411b363 PR |
329 | struct drbd_epoch_entry *e; |
330 | struct page *page; | |
45bb912b | 331 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 PR |
332 | |
333 | if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE)) | |
334 | return NULL; | |
335 | ||
336 | e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); | |
337 | if (!e) { | |
338 | if (!(gfp_mask & __GFP_NOWARN)) | |
339 | dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); | |
340 | return NULL; | |
341 | } | |
342 | ||
45bb912b LE |
343 | page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); |
344 | if (!page) | |
345 | goto fail; | |
b411b363 | 346 | |
b411b363 PR |
347 | INIT_HLIST_NODE(&e->colision); |
348 | e->epoch = NULL; | |
45bb912b LE |
349 | e->mdev = mdev; |
350 | e->pages = page; | |
351 | atomic_set(&e->pending_bios, 0); | |
352 | e->size = data_size; | |
b411b363 | 353 | e->flags = 0; |
45bb912b | 354 | e->sector = sector; |
45bb912b | 355 | e->block_id = id; |
b411b363 | 356 | |
b411b363 PR |
357 | return e; |
358 | ||
45bb912b | 359 | fail: |
b411b363 | 360 | mempool_free(e, drbd_ee_mempool); |
b411b363 PR |
361 | return NULL; |
362 | } | |
363 | ||
435f0740 | 364 | void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, int is_net) |
b411b363 | 365 | { |
c36c3ced LE |
366 | if (e->flags & EE_HAS_DIGEST) |
367 | kfree(e->digest); | |
435f0740 | 368 | drbd_pp_free(mdev, e->pages, is_net); |
45bb912b | 369 | D_ASSERT(atomic_read(&e->pending_bios) == 0); |
b411b363 PR |
370 | D_ASSERT(hlist_unhashed(&e->colision)); |
371 | mempool_free(e, drbd_ee_mempool); | |
372 | } | |
373 | ||
374 | int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) | |
375 | { | |
376 | LIST_HEAD(work_list); | |
377 | struct drbd_epoch_entry *e, *t; | |
378 | int count = 0; | |
435f0740 | 379 | int is_net = list == &mdev->net_ee; |
b411b363 PR |
380 | |
381 | spin_lock_irq(&mdev->req_lock); | |
382 | list_splice_init(list, &work_list); | |
383 | spin_unlock_irq(&mdev->req_lock); | |
384 | ||
385 | list_for_each_entry_safe(e, t, &work_list, w.list) { | |
435f0740 | 386 | drbd_free_some_ee(mdev, e, is_net); |
b411b363 PR |
387 | count++; |
388 | } | |
389 | return count; | |
390 | } | |
391 | ||
392 | ||
393 | /* | |
394 | * This function is called from _asender only_ | |
395 | * but see also comments in _req_mod(,barrier_acked) | |
396 | * and receive_Barrier. | |
397 | * | |
398 | * Move entries from net_ee to done_ee, if ready. | |
399 | * Grab done_ee, call all callbacks, free the entries. | |
400 | * The callbacks typically send out ACKs. | |
401 | */ | |
402 | static int drbd_process_done_ee(struct drbd_conf *mdev) | |
403 | { | |
404 | LIST_HEAD(work_list); | |
405 | LIST_HEAD(reclaimed); | |
406 | struct drbd_epoch_entry *e, *t; | |
407 | int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); | |
408 | ||
409 | spin_lock_irq(&mdev->req_lock); | |
410 | reclaim_net_ee(mdev, &reclaimed); | |
411 | list_splice_init(&mdev->done_ee, &work_list); | |
412 | spin_unlock_irq(&mdev->req_lock); | |
413 | ||
414 | list_for_each_entry_safe(e, t, &reclaimed, w.list) | |
435f0740 | 415 | drbd_free_net_ee(mdev, e); |
b411b363 PR |
416 | |
417 | /* possible callbacks here: | |
418 | * e_end_block, and e_end_resync_block, e_send_discard_ack. | |
419 | * all ignore the last argument. | |
420 | */ | |
421 | list_for_each_entry_safe(e, t, &work_list, w.list) { | |
b411b363 PR |
422 | /* list_del not necessary, next/prev members not touched */ |
423 | ok = e->w.cb(mdev, &e->w, !ok) && ok; | |
424 | drbd_free_ee(mdev, e); | |
425 | } | |
426 | wake_up(&mdev->ee_wait); | |
427 | ||
428 | return ok; | |
429 | } | |
430 | ||
431 | void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) | |
432 | { | |
433 | DEFINE_WAIT(wait); | |
434 | ||
435 | /* avoids spin_lock/unlock | |
436 | * and calling prepare_to_wait in the fast path */ | |
437 | while (!list_empty(head)) { | |
438 | prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); | |
439 | spin_unlock_irq(&mdev->req_lock); | |
440 | drbd_kick_lo(mdev); | |
441 | schedule(); | |
442 | finish_wait(&mdev->ee_wait, &wait); | |
443 | spin_lock_irq(&mdev->req_lock); | |
444 | } | |
445 | } | |
446 | ||
447 | void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) | |
448 | { | |
449 | spin_lock_irq(&mdev->req_lock); | |
450 | _drbd_wait_ee_list_empty(mdev, head); | |
451 | spin_unlock_irq(&mdev->req_lock); | |
452 | } | |
453 | ||
454 | /* see also kernel_accept; which is only present since 2.6.18. | |
455 | * also we want to log which part of it failed, exactly */ | |
456 | static int drbd_accept(struct drbd_conf *mdev, const char **what, | |
457 | struct socket *sock, struct socket **newsock) | |
458 | { | |
459 | struct sock *sk = sock->sk; | |
460 | int err = 0; | |
461 | ||
462 | *what = "listen"; | |
463 | err = sock->ops->listen(sock, 5); | |
464 | if (err < 0) | |
465 | goto out; | |
466 | ||
467 | *what = "sock_create_lite"; | |
468 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
469 | newsock); | |
470 | if (err < 0) | |
471 | goto out; | |
472 | ||
473 | *what = "accept"; | |
474 | err = sock->ops->accept(sock, *newsock, 0); | |
475 | if (err < 0) { | |
476 | sock_release(*newsock); | |
477 | *newsock = NULL; | |
478 | goto out; | |
479 | } | |
480 | (*newsock)->ops = sock->ops; | |
481 | ||
482 | out: | |
483 | return err; | |
484 | } | |
485 | ||
486 | static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, | |
487 | void *buf, size_t size, int flags) | |
488 | { | |
489 | mm_segment_t oldfs; | |
490 | struct kvec iov = { | |
491 | .iov_base = buf, | |
492 | .iov_len = size, | |
493 | }; | |
494 | struct msghdr msg = { | |
495 | .msg_iovlen = 1, | |
496 | .msg_iov = (struct iovec *)&iov, | |
497 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
498 | }; | |
499 | int rv; | |
500 | ||
501 | oldfs = get_fs(); | |
502 | set_fs(KERNEL_DS); | |
503 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
504 | set_fs(oldfs); | |
505 | ||
506 | return rv; | |
507 | } | |
508 | ||
509 | static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) | |
510 | { | |
511 | mm_segment_t oldfs; | |
512 | struct kvec iov = { | |
513 | .iov_base = buf, | |
514 | .iov_len = size, | |
515 | }; | |
516 | struct msghdr msg = { | |
517 | .msg_iovlen = 1, | |
518 | .msg_iov = (struct iovec *)&iov, | |
519 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
520 | }; | |
521 | int rv; | |
522 | ||
523 | oldfs = get_fs(); | |
524 | set_fs(KERNEL_DS); | |
525 | ||
526 | for (;;) { | |
527 | rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); | |
528 | if (rv == size) | |
529 | break; | |
530 | ||
531 | /* Note: | |
532 | * ECONNRESET other side closed the connection | |
533 | * ERESTARTSYS (on sock) we got a signal | |
534 | */ | |
535 | ||
536 | if (rv < 0) { | |
537 | if (rv == -ECONNRESET) | |
538 | dev_info(DEV, "sock was reset by peer\n"); | |
539 | else if (rv != -ERESTARTSYS) | |
540 | dev_err(DEV, "sock_recvmsg returned %d\n", rv); | |
541 | break; | |
542 | } else if (rv == 0) { | |
543 | dev_info(DEV, "sock was shut down by peer\n"); | |
544 | break; | |
545 | } else { | |
546 | /* signal came in, or peer/link went down, | |
547 | * after we read a partial message | |
548 | */ | |
549 | /* D_ASSERT(signal_pending(current)); */ | |
550 | break; | |
551 | } | |
552 | }; | |
553 | ||
554 | set_fs(oldfs); | |
555 | ||
556 | if (rv != size) | |
557 | drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); | |
558 | ||
559 | return rv; | |
560 | } | |
561 | ||
5dbf1673 LE |
562 | /* quoting tcp(7): |
563 | * On individual connections, the socket buffer size must be set prior to the | |
564 | * listen(2) or connect(2) calls in order to have it take effect. | |
565 | * This is our wrapper to do so. | |
566 | */ | |
567 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
568 | unsigned int rcv) | |
569 | { | |
570 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
571 | if (snd) { | |
572 | sock->sk->sk_sndbuf = snd; | |
573 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
574 | } | |
575 | if (rcv) { | |
576 | sock->sk->sk_rcvbuf = rcv; | |
577 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
578 | } | |
579 | } | |
580 | ||
b411b363 PR |
581 | static struct socket *drbd_try_connect(struct drbd_conf *mdev) |
582 | { | |
583 | const char *what; | |
584 | struct socket *sock; | |
585 | struct sockaddr_in6 src_in6; | |
586 | int err; | |
587 | int disconnect_on_error = 1; | |
588 | ||
589 | if (!get_net_conf(mdev)) | |
590 | return NULL; | |
591 | ||
592 | what = "sock_create_kern"; | |
593 | err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, | |
594 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
595 | if (err < 0) { | |
596 | sock = NULL; | |
597 | goto out; | |
598 | } | |
599 | ||
600 | sock->sk->sk_rcvtimeo = | |
601 | sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; | |
5dbf1673 LE |
602 | drbd_setbufsize(sock, mdev->net_conf->sndbuf_size, |
603 | mdev->net_conf->rcvbuf_size); | |
b411b363 PR |
604 | |
605 | /* explicitly bind to the configured IP as source IP | |
606 | * for the outgoing connections. | |
607 | * This is needed for multihomed hosts and to be | |
608 | * able to use lo: interfaces for drbd. | |
609 | * Make sure to use 0 as port number, so linux selects | |
610 | * a free one dynamically. | |
611 | */ | |
612 | memcpy(&src_in6, mdev->net_conf->my_addr, | |
613 | min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); | |
614 | if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) | |
615 | src_in6.sin6_port = 0; | |
616 | else | |
617 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
618 | ||
619 | what = "bind before connect"; | |
620 | err = sock->ops->bind(sock, | |
621 | (struct sockaddr *) &src_in6, | |
622 | mdev->net_conf->my_addr_len); | |
623 | if (err < 0) | |
624 | goto out; | |
625 | ||
626 | /* connect may fail, peer not yet available. | |
627 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
628 | disconnect_on_error = 0; | |
629 | what = "connect"; | |
630 | err = sock->ops->connect(sock, | |
631 | (struct sockaddr *)mdev->net_conf->peer_addr, | |
632 | mdev->net_conf->peer_addr_len, 0); | |
633 | ||
634 | out: | |
635 | if (err < 0) { | |
636 | if (sock) { | |
637 | sock_release(sock); | |
638 | sock = NULL; | |
639 | } | |
640 | switch (-err) { | |
641 | /* timeout, busy, signal pending */ | |
642 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
643 | case EINTR: case ERESTARTSYS: | |
644 | /* peer not (yet) available, network problem */ | |
645 | case ECONNREFUSED: case ENETUNREACH: | |
646 | case EHOSTDOWN: case EHOSTUNREACH: | |
647 | disconnect_on_error = 0; | |
648 | break; | |
649 | default: | |
650 | dev_err(DEV, "%s failed, err = %d\n", what, err); | |
651 | } | |
652 | if (disconnect_on_error) | |
653 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
654 | } | |
655 | put_net_conf(mdev); | |
656 | return sock; | |
657 | } | |
658 | ||
659 | static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) | |
660 | { | |
661 | int timeo, err; | |
662 | struct socket *s_estab = NULL, *s_listen; | |
663 | const char *what; | |
664 | ||
665 | if (!get_net_conf(mdev)) | |
666 | return NULL; | |
667 | ||
668 | what = "sock_create_kern"; | |
669 | err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, | |
670 | SOCK_STREAM, IPPROTO_TCP, &s_listen); | |
671 | if (err) { | |
672 | s_listen = NULL; | |
673 | goto out; | |
674 | } | |
675 | ||
676 | timeo = mdev->net_conf->try_connect_int * HZ; | |
677 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ | |
678 | ||
679 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
680 | s_listen->sk->sk_rcvtimeo = timeo; | |
681 | s_listen->sk->sk_sndtimeo = timeo; | |
5dbf1673 LE |
682 | drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size, |
683 | mdev->net_conf->rcvbuf_size); | |
b411b363 PR |
684 | |
685 | what = "bind before listen"; | |
686 | err = s_listen->ops->bind(s_listen, | |
687 | (struct sockaddr *) mdev->net_conf->my_addr, | |
688 | mdev->net_conf->my_addr_len); | |
689 | if (err < 0) | |
690 | goto out; | |
691 | ||
692 | err = drbd_accept(mdev, &what, s_listen, &s_estab); | |
693 | ||
694 | out: | |
695 | if (s_listen) | |
696 | sock_release(s_listen); | |
697 | if (err < 0) { | |
698 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
699 | dev_err(DEV, "%s failed, err = %d\n", what, err); | |
700 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
701 | } | |
702 | } | |
703 | put_net_conf(mdev); | |
704 | ||
705 | return s_estab; | |
706 | } | |
707 | ||
708 | static int drbd_send_fp(struct drbd_conf *mdev, | |
709 | struct socket *sock, enum drbd_packets cmd) | |
710 | { | |
02918be2 | 711 | struct p_header80 *h = &mdev->data.sbuf.header.h80; |
b411b363 PR |
712 | |
713 | return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); | |
714 | } | |
715 | ||
716 | static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) | |
717 | { | |
02918be2 | 718 | struct p_header80 *h = &mdev->data.rbuf.header.h80; |
b411b363 PR |
719 | int rr; |
720 | ||
721 | rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); | |
722 | ||
723 | if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) | |
724 | return be16_to_cpu(h->command); | |
725 | ||
726 | return 0xffff; | |
727 | } | |
728 | ||
729 | /** | |
730 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
731 | * @mdev: DRBD device. | |
732 | * @sock: pointer to the pointer to the socket. | |
733 | */ | |
734 | static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) | |
735 | { | |
736 | int rr; | |
737 | char tb[4]; | |
738 | ||
739 | if (!*sock) | |
740 | return FALSE; | |
741 | ||
742 | rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); | |
743 | ||
744 | if (rr > 0 || rr == -EAGAIN) { | |
745 | return TRUE; | |
746 | } else { | |
747 | sock_release(*sock); | |
748 | *sock = NULL; | |
749 | return FALSE; | |
750 | } | |
751 | } | |
752 | ||
753 | /* | |
754 | * return values: | |
755 | * 1 yes, we have a valid connection | |
756 | * 0 oops, did not work out, please try again | |
757 | * -1 peer talks different language, | |
758 | * no point in trying again, please go standalone. | |
759 | * -2 We do not have a network config... | |
760 | */ | |
761 | static int drbd_connect(struct drbd_conf *mdev) | |
762 | { | |
763 | struct socket *s, *sock, *msock; | |
764 | int try, h, ok; | |
765 | ||
766 | D_ASSERT(!mdev->data.socket); | |
767 | ||
b411b363 PR |
768 | if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) |
769 | return -2; | |
770 | ||
771 | clear_bit(DISCARD_CONCURRENT, &mdev->flags); | |
772 | ||
773 | sock = NULL; | |
774 | msock = NULL; | |
775 | ||
776 | do { | |
777 | for (try = 0;;) { | |
778 | /* 3 tries, this should take less than a second! */ | |
779 | s = drbd_try_connect(mdev); | |
780 | if (s || ++try >= 3) | |
781 | break; | |
782 | /* give the other side time to call bind() & listen() */ | |
783 | __set_current_state(TASK_INTERRUPTIBLE); | |
784 | schedule_timeout(HZ / 10); | |
785 | } | |
786 | ||
787 | if (s) { | |
788 | if (!sock) { | |
789 | drbd_send_fp(mdev, s, P_HAND_SHAKE_S); | |
790 | sock = s; | |
791 | s = NULL; | |
792 | } else if (!msock) { | |
793 | drbd_send_fp(mdev, s, P_HAND_SHAKE_M); | |
794 | msock = s; | |
795 | s = NULL; | |
796 | } else { | |
797 | dev_err(DEV, "Logic error in drbd_connect()\n"); | |
798 | goto out_release_sockets; | |
799 | } | |
800 | } | |
801 | ||
802 | if (sock && msock) { | |
803 | __set_current_state(TASK_INTERRUPTIBLE); | |
804 | schedule_timeout(HZ / 10); | |
805 | ok = drbd_socket_okay(mdev, &sock); | |
806 | ok = drbd_socket_okay(mdev, &msock) && ok; | |
807 | if (ok) | |
808 | break; | |
809 | } | |
810 | ||
811 | retry: | |
812 | s = drbd_wait_for_connect(mdev); | |
813 | if (s) { | |
814 | try = drbd_recv_fp(mdev, s); | |
815 | drbd_socket_okay(mdev, &sock); | |
816 | drbd_socket_okay(mdev, &msock); | |
817 | switch (try) { | |
818 | case P_HAND_SHAKE_S: | |
819 | if (sock) { | |
820 | dev_warn(DEV, "initial packet S crossed\n"); | |
821 | sock_release(sock); | |
822 | } | |
823 | sock = s; | |
824 | break; | |
825 | case P_HAND_SHAKE_M: | |
826 | if (msock) { | |
827 | dev_warn(DEV, "initial packet M crossed\n"); | |
828 | sock_release(msock); | |
829 | } | |
830 | msock = s; | |
831 | set_bit(DISCARD_CONCURRENT, &mdev->flags); | |
832 | break; | |
833 | default: | |
834 | dev_warn(DEV, "Error receiving initial packet\n"); | |
835 | sock_release(s); | |
836 | if (random32() & 1) | |
837 | goto retry; | |
838 | } | |
839 | } | |
840 | ||
841 | if (mdev->state.conn <= C_DISCONNECTING) | |
842 | goto out_release_sockets; | |
843 | if (signal_pending(current)) { | |
844 | flush_signals(current); | |
845 | smp_rmb(); | |
846 | if (get_t_state(&mdev->receiver) == Exiting) | |
847 | goto out_release_sockets; | |
848 | } | |
849 | ||
850 | if (sock && msock) { | |
851 | ok = drbd_socket_okay(mdev, &sock); | |
852 | ok = drbd_socket_okay(mdev, &msock) && ok; | |
853 | if (ok) | |
854 | break; | |
855 | } | |
856 | } while (1); | |
857 | ||
858 | msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
859 | sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
860 | ||
861 | sock->sk->sk_allocation = GFP_NOIO; | |
862 | msock->sk->sk_allocation = GFP_NOIO; | |
863 | ||
864 | sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; | |
865 | msock->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
866 | ||
b411b363 PR |
867 | /* NOT YET ... |
868 | * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
869 | * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
870 | * first set it to the P_HAND_SHAKE timeout, | |
871 | * which we set to 4x the configured ping_timeout. */ | |
872 | sock->sk->sk_sndtimeo = | |
873 | sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; | |
874 | ||
875 | msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
876 | msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; | |
877 | ||
878 | /* we don't want delays. | |
879 | * we use TCP_CORK where apropriate, though */ | |
880 | drbd_tcp_nodelay(sock); | |
881 | drbd_tcp_nodelay(msock); | |
882 | ||
883 | mdev->data.socket = sock; | |
884 | mdev->meta.socket = msock; | |
885 | mdev->last_received = jiffies; | |
886 | ||
887 | D_ASSERT(mdev->asender.task == NULL); | |
888 | ||
889 | h = drbd_do_handshake(mdev); | |
890 | if (h <= 0) | |
891 | return h; | |
892 | ||
893 | if (mdev->cram_hmac_tfm) { | |
894 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ | |
b10d96cb JT |
895 | switch (drbd_do_auth(mdev)) { |
896 | case -1: | |
b411b363 PR |
897 | dev_err(DEV, "Authentication of peer failed\n"); |
898 | return -1; | |
b10d96cb JT |
899 | case 0: |
900 | dev_err(DEV, "Authentication of peer failed, trying again.\n"); | |
901 | return 0; | |
b411b363 PR |
902 | } |
903 | } | |
904 | ||
905 | if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) | |
906 | return 0; | |
907 | ||
908 | sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
909 | sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
910 | ||
911 | atomic_set(&mdev->packet_seq, 0); | |
912 | mdev->peer_seq = 0; | |
913 | ||
914 | drbd_thread_start(&mdev->asender); | |
915 | ||
d5373389 PR |
916 | if (mdev->agreed_pro_version < 95 && get_ldev(mdev)) { |
917 | drbd_setup_queue_param(mdev, DRBD_MAX_SIZE_H80_PACKET); | |
918 | put_ldev(mdev); | |
919 | } | |
920 | ||
7e2455c1 PR |
921 | if (!drbd_send_protocol(mdev)) |
922 | return -1; | |
b411b363 | 923 | drbd_send_sync_param(mdev, &mdev->sync_conf); |
e89b591c | 924 | drbd_send_sizes(mdev, 0, 0); |
b411b363 PR |
925 | drbd_send_uuids(mdev); |
926 | drbd_send_state(mdev); | |
927 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); | |
928 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
929 | ||
930 | return 1; | |
931 | ||
932 | out_release_sockets: | |
933 | if (sock) | |
934 | sock_release(sock); | |
935 | if (msock) | |
936 | sock_release(msock); | |
937 | return -1; | |
938 | } | |
939 | ||
02918be2 | 940 | static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size) |
b411b363 | 941 | { |
02918be2 | 942 | union p_header *h = &mdev->data.rbuf.header; |
b411b363 PR |
943 | int r; |
944 | ||
945 | r = drbd_recv(mdev, h, sizeof(*h)); | |
b411b363 PR |
946 | if (unlikely(r != sizeof(*h))) { |
947 | dev_err(DEV, "short read expecting header on sock: r=%d\n", r); | |
948 | return FALSE; | |
02918be2 PR |
949 | } |
950 | ||
951 | if (likely(h->h80.magic == BE_DRBD_MAGIC)) { | |
952 | *cmd = be16_to_cpu(h->h80.command); | |
953 | *packet_size = be16_to_cpu(h->h80.length); | |
954 | } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) { | |
955 | *cmd = be16_to_cpu(h->h95.command); | |
956 | *packet_size = be32_to_cpu(h->h95.length); | |
957 | } else { | |
004352fa LE |
958 | dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", |
959 | be32_to_cpu(h->h80.magic), | |
960 | be16_to_cpu(h->h80.command), | |
961 | be16_to_cpu(h->h80.length)); | |
b411b363 PR |
962 | return FALSE; |
963 | } | |
964 | mdev->last_received = jiffies; | |
965 | ||
966 | return TRUE; | |
967 | } | |
968 | ||
2451fc3b | 969 | static void drbd_flush(struct drbd_conf *mdev) |
b411b363 PR |
970 | { |
971 | int rv; | |
972 | ||
973 | if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { | |
fbd9b09a | 974 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, |
dd3932ed | 975 | NULL); |
b411b363 PR |
976 | if (rv) { |
977 | dev_err(DEV, "local disk flush failed with status %d\n", rv); | |
978 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
979 | * don't try again for ANY return value != 0 | |
980 | * if (rv == -EOPNOTSUPP) */ | |
981 | drbd_bump_write_ordering(mdev, WO_drain_io); | |
982 | } | |
983 | put_ldev(mdev); | |
984 | } | |
b411b363 PR |
985 | } |
986 | ||
987 | /** | |
988 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
989 | * @mdev: DRBD device. | |
990 | * @epoch: Epoch object. | |
991 | * @ev: Epoch event. | |
992 | */ | |
993 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, | |
994 | struct drbd_epoch *epoch, | |
995 | enum epoch_event ev) | |
996 | { | |
2451fc3b | 997 | int epoch_size; |
b411b363 | 998 | struct drbd_epoch *next_epoch; |
b411b363 PR |
999 | enum finish_epoch rv = FE_STILL_LIVE; |
1000 | ||
1001 | spin_lock(&mdev->epoch_lock); | |
1002 | do { | |
1003 | next_epoch = NULL; | |
b411b363 PR |
1004 | |
1005 | epoch_size = atomic_read(&epoch->epoch_size); | |
1006 | ||
1007 | switch (ev & ~EV_CLEANUP) { | |
1008 | case EV_PUT: | |
1009 | atomic_dec(&epoch->active); | |
1010 | break; | |
1011 | case EV_GOT_BARRIER_NR: | |
1012 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1013 | break; |
1014 | case EV_BECAME_LAST: | |
1015 | /* nothing to do*/ | |
1016 | break; | |
1017 | } | |
1018 | ||
b411b363 PR |
1019 | if (epoch_size != 0 && |
1020 | atomic_read(&epoch->active) == 0 && | |
2451fc3b | 1021 | test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { |
b411b363 PR |
1022 | if (!(ev & EV_CLEANUP)) { |
1023 | spin_unlock(&mdev->epoch_lock); | |
1024 | drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); | |
1025 | spin_lock(&mdev->epoch_lock); | |
1026 | } | |
1027 | dec_unacked(mdev); | |
1028 | ||
1029 | if (mdev->current_epoch != epoch) { | |
1030 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); | |
1031 | list_del(&epoch->list); | |
1032 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
1033 | mdev->epochs--; | |
b411b363 PR |
1034 | kfree(epoch); |
1035 | ||
1036 | if (rv == FE_STILL_LIVE) | |
1037 | rv = FE_DESTROYED; | |
1038 | } else { | |
1039 | epoch->flags = 0; | |
1040 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1041 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1042 | if (rv == FE_STILL_LIVE) |
1043 | rv = FE_RECYCLED; | |
2451fc3b | 1044 | wake_up(&mdev->ee_wait); |
b411b363 PR |
1045 | } |
1046 | } | |
1047 | ||
1048 | if (!next_epoch) | |
1049 | break; | |
1050 | ||
1051 | epoch = next_epoch; | |
1052 | } while (1); | |
1053 | ||
1054 | spin_unlock(&mdev->epoch_lock); | |
1055 | ||
b411b363 PR |
1056 | return rv; |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
1061 | * @mdev: DRBD device. | |
1062 | * @wo: Write ordering method to try. | |
1063 | */ | |
1064 | void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) | |
1065 | { | |
1066 | enum write_ordering_e pwo; | |
1067 | static char *write_ordering_str[] = { | |
1068 | [WO_none] = "none", | |
1069 | [WO_drain_io] = "drain", | |
1070 | [WO_bdev_flush] = "flush", | |
b411b363 PR |
1071 | }; |
1072 | ||
1073 | pwo = mdev->write_ordering; | |
1074 | wo = min(pwo, wo); | |
b411b363 PR |
1075 | if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) |
1076 | wo = WO_drain_io; | |
1077 | if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) | |
1078 | wo = WO_none; | |
1079 | mdev->write_ordering = wo; | |
2451fc3b | 1080 | if (pwo != mdev->write_ordering || wo == WO_bdev_flush) |
b411b363 PR |
1081 | dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); |
1082 | } | |
1083 | ||
45bb912b LE |
1084 | /** |
1085 | * drbd_submit_ee() | |
1086 | * @mdev: DRBD device. | |
1087 | * @e: epoch entry | |
1088 | * @rw: flag field, see bio->bi_rw | |
1089 | */ | |
1090 | /* TODO allocate from our own bio_set. */ | |
1091 | int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, | |
1092 | const unsigned rw, const int fault_type) | |
1093 | { | |
1094 | struct bio *bios = NULL; | |
1095 | struct bio *bio; | |
1096 | struct page *page = e->pages; | |
1097 | sector_t sector = e->sector; | |
1098 | unsigned ds = e->size; | |
1099 | unsigned n_bios = 0; | |
1100 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
1101 | ||
1102 | /* In most cases, we will only need one bio. But in case the lower | |
1103 | * level restrictions happen to be different at this offset on this | |
1104 | * side than those of the sending peer, we may need to submit the | |
1105 | * request in more than one bio. */ | |
1106 | next_bio: | |
1107 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1108 | if (!bio) { | |
1109 | dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); | |
1110 | goto fail; | |
1111 | } | |
1112 | /* > e->sector, unless this is the first bio */ | |
1113 | bio->bi_sector = sector; | |
1114 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
1115 | /* we special case some flags in the multi-bio case, see below | |
2451fc3b | 1116 | * (REQ_UNPLUG) */ |
45bb912b LE |
1117 | bio->bi_rw = rw; |
1118 | bio->bi_private = e; | |
1119 | bio->bi_end_io = drbd_endio_sec; | |
1120 | ||
1121 | bio->bi_next = bios; | |
1122 | bios = bio; | |
1123 | ++n_bios; | |
1124 | ||
1125 | page_chain_for_each(page) { | |
1126 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1127 | if (!bio_add_page(bio, page, len, 0)) { | |
1128 | /* a single page must always be possible! */ | |
1129 | BUG_ON(bio->bi_vcnt == 0); | |
1130 | goto next_bio; | |
1131 | } | |
1132 | ds -= len; | |
1133 | sector += len >> 9; | |
1134 | --nr_pages; | |
1135 | } | |
1136 | D_ASSERT(page == NULL); | |
1137 | D_ASSERT(ds == 0); | |
1138 | ||
1139 | atomic_set(&e->pending_bios, n_bios); | |
1140 | do { | |
1141 | bio = bios; | |
1142 | bios = bios->bi_next; | |
1143 | bio->bi_next = NULL; | |
1144 | ||
7b6d91da | 1145 | /* strip off REQ_UNPLUG unless it is the last bio */ |
45bb912b | 1146 | if (bios) |
7b6d91da | 1147 | bio->bi_rw &= ~REQ_UNPLUG; |
45bb912b LE |
1148 | |
1149 | drbd_generic_make_request(mdev, fault_type, bio); | |
45bb912b LE |
1150 | } while (bios); |
1151 | maybe_kick_lo(mdev); | |
1152 | return 0; | |
1153 | ||
1154 | fail: | |
1155 | while (bios) { | |
1156 | bio = bios; | |
1157 | bios = bios->bi_next; | |
1158 | bio_put(bio); | |
1159 | } | |
1160 | return -ENOMEM; | |
1161 | } | |
1162 | ||
02918be2 | 1163 | static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 1164 | { |
2451fc3b | 1165 | int rv; |
02918be2 | 1166 | struct p_barrier *p = &mdev->data.rbuf.barrier; |
b411b363 PR |
1167 | struct drbd_epoch *epoch; |
1168 | ||
b411b363 PR |
1169 | inc_unacked(mdev); |
1170 | ||
1171 | if (mdev->net_conf->wire_protocol != DRBD_PROT_C) | |
1172 | drbd_kick_lo(mdev); | |
1173 | ||
1174 | mdev->current_epoch->barrier_nr = p->barrier; | |
1175 | rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); | |
1176 | ||
1177 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1178 | * the activity log, which means it would not be resynced in case the | |
1179 | * R_PRIMARY crashes now. | |
1180 | * Therefore we must send the barrier_ack after the barrier request was | |
1181 | * completed. */ | |
1182 | switch (mdev->write_ordering) { | |
b411b363 PR |
1183 | case WO_none: |
1184 | if (rv == FE_RECYCLED) | |
1185 | return TRUE; | |
2451fc3b PR |
1186 | |
1187 | /* receiver context, in the writeout path of the other node. | |
1188 | * avoid potential distributed deadlock */ | |
1189 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1190 | if (epoch) | |
1191 | break; | |
1192 | else | |
1193 | dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); | |
1194 | /* Fall through */ | |
b411b363 PR |
1195 | |
1196 | case WO_bdev_flush: | |
1197 | case WO_drain_io: | |
b411b363 | 1198 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
2451fc3b PR |
1199 | drbd_flush(mdev); |
1200 | ||
1201 | if (atomic_read(&mdev->current_epoch->epoch_size)) { | |
1202 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1203 | if (epoch) | |
1204 | break; | |
b411b363 PR |
1205 | } |
1206 | ||
2451fc3b PR |
1207 | epoch = mdev->current_epoch; |
1208 | wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); | |
1209 | ||
1210 | D_ASSERT(atomic_read(&epoch->active) == 0); | |
1211 | D_ASSERT(epoch->flags == 0); | |
b411b363 PR |
1212 | |
1213 | return TRUE; | |
2451fc3b PR |
1214 | default: |
1215 | dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); | |
1216 | return FALSE; | |
b411b363 PR |
1217 | } |
1218 | ||
1219 | epoch->flags = 0; | |
1220 | atomic_set(&epoch->epoch_size, 0); | |
1221 | atomic_set(&epoch->active, 0); | |
1222 | ||
1223 | spin_lock(&mdev->epoch_lock); | |
1224 | if (atomic_read(&mdev->current_epoch->epoch_size)) { | |
1225 | list_add(&epoch->list, &mdev->current_epoch->list); | |
1226 | mdev->current_epoch = epoch; | |
1227 | mdev->epochs++; | |
b411b363 PR |
1228 | } else { |
1229 | /* The current_epoch got recycled while we allocated this one... */ | |
1230 | kfree(epoch); | |
1231 | } | |
1232 | spin_unlock(&mdev->epoch_lock); | |
1233 | ||
1234 | return TRUE; | |
1235 | } | |
1236 | ||
1237 | /* used from receive_RSDataReply (recv_resync_read) | |
1238 | * and from receive_Data */ | |
1239 | static struct drbd_epoch_entry * | |
1240 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) | |
1241 | { | |
6666032a | 1242 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
b411b363 | 1243 | struct drbd_epoch_entry *e; |
b411b363 | 1244 | struct page *page; |
45bb912b | 1245 | int dgs, ds, rr; |
b411b363 PR |
1246 | void *dig_in = mdev->int_dig_in; |
1247 | void *dig_vv = mdev->int_dig_vv; | |
6b4388ac | 1248 | unsigned long *data; |
b411b363 PR |
1249 | |
1250 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? | |
1251 | crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; | |
1252 | ||
1253 | if (dgs) { | |
1254 | rr = drbd_recv(mdev, dig_in, dgs); | |
1255 | if (rr != dgs) { | |
1256 | dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", | |
1257 | rr, dgs); | |
1258 | return NULL; | |
1259 | } | |
1260 | } | |
1261 | ||
1262 | data_size -= dgs; | |
1263 | ||
1264 | ERR_IF(data_size & 0x1ff) return NULL; | |
1265 | ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL; | |
1266 | ||
6666032a LE |
1267 | /* even though we trust out peer, |
1268 | * we sometimes have to double check. */ | |
1269 | if (sector + (data_size>>9) > capacity) { | |
1270 | dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n", | |
1271 | (unsigned long long)capacity, | |
1272 | (unsigned long long)sector, data_size); | |
1273 | return NULL; | |
1274 | } | |
1275 | ||
b411b363 PR |
1276 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1277 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1278 | * which in turn might block on the other node at this very place. */ | |
1279 | e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); | |
1280 | if (!e) | |
1281 | return NULL; | |
45bb912b | 1282 | |
b411b363 | 1283 | ds = data_size; |
45bb912b LE |
1284 | page = e->pages; |
1285 | page_chain_for_each(page) { | |
1286 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1287 | data = kmap(page); |
45bb912b | 1288 | rr = drbd_recv(mdev, data, len); |
6b4388ac PR |
1289 | if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) { |
1290 | dev_err(DEV, "Fault injection: Corrupting data on receive\n"); | |
1291 | data[0] = data[0] ^ (unsigned long)-1; | |
1292 | } | |
b411b363 | 1293 | kunmap(page); |
45bb912b | 1294 | if (rr != len) { |
b411b363 PR |
1295 | drbd_free_ee(mdev, e); |
1296 | dev_warn(DEV, "short read receiving data: read %d expected %d\n", | |
45bb912b | 1297 | rr, len); |
b411b363 PR |
1298 | return NULL; |
1299 | } | |
1300 | ds -= rr; | |
1301 | } | |
1302 | ||
1303 | if (dgs) { | |
45bb912b | 1304 | drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); |
b411b363 PR |
1305 | if (memcmp(dig_in, dig_vv, dgs)) { |
1306 | dev_err(DEV, "Digest integrity check FAILED.\n"); | |
1307 | drbd_bcast_ee(mdev, "digest failed", | |
1308 | dgs, dig_in, dig_vv, e); | |
1309 | drbd_free_ee(mdev, e); | |
1310 | return NULL; | |
1311 | } | |
1312 | } | |
1313 | mdev->recv_cnt += data_size>>9; | |
1314 | return e; | |
1315 | } | |
1316 | ||
1317 | /* drbd_drain_block() just takes a data block | |
1318 | * out of the socket input buffer, and discards it. | |
1319 | */ | |
1320 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1321 | { | |
1322 | struct page *page; | |
1323 | int rr, rv = 1; | |
1324 | void *data; | |
1325 | ||
c3470cde LE |
1326 | if (!data_size) |
1327 | return TRUE; | |
1328 | ||
45bb912b | 1329 | page = drbd_pp_alloc(mdev, 1, 1); |
b411b363 PR |
1330 | |
1331 | data = kmap(page); | |
1332 | while (data_size) { | |
1333 | rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); | |
1334 | if (rr != min_t(int, data_size, PAGE_SIZE)) { | |
1335 | rv = 0; | |
1336 | dev_warn(DEV, "short read receiving data: read %d expected %d\n", | |
1337 | rr, min_t(int, data_size, PAGE_SIZE)); | |
1338 | break; | |
1339 | } | |
1340 | data_size -= rr; | |
1341 | } | |
1342 | kunmap(page); | |
435f0740 | 1343 | drbd_pp_free(mdev, page, 0); |
b411b363 PR |
1344 | return rv; |
1345 | } | |
1346 | ||
1347 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1348 | sector_t sector, int data_size) | |
1349 | { | |
1350 | struct bio_vec *bvec; | |
1351 | struct bio *bio; | |
1352 | int dgs, rr, i, expect; | |
1353 | void *dig_in = mdev->int_dig_in; | |
1354 | void *dig_vv = mdev->int_dig_vv; | |
1355 | ||
1356 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? | |
1357 | crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; | |
1358 | ||
1359 | if (dgs) { | |
1360 | rr = drbd_recv(mdev, dig_in, dgs); | |
1361 | if (rr != dgs) { | |
1362 | dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", | |
1363 | rr, dgs); | |
1364 | return 0; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | data_size -= dgs; | |
1369 | ||
1370 | /* optimistically update recv_cnt. if receiving fails below, | |
1371 | * we disconnect anyways, and counters will be reset. */ | |
1372 | mdev->recv_cnt += data_size>>9; | |
1373 | ||
1374 | bio = req->master_bio; | |
1375 | D_ASSERT(sector == bio->bi_sector); | |
1376 | ||
1377 | bio_for_each_segment(bvec, bio, i) { | |
1378 | expect = min_t(int, data_size, bvec->bv_len); | |
1379 | rr = drbd_recv(mdev, | |
1380 | kmap(bvec->bv_page)+bvec->bv_offset, | |
1381 | expect); | |
1382 | kunmap(bvec->bv_page); | |
1383 | if (rr != expect) { | |
1384 | dev_warn(DEV, "short read receiving data reply: " | |
1385 | "read %d expected %d\n", | |
1386 | rr, expect); | |
1387 | return 0; | |
1388 | } | |
1389 | data_size -= rr; | |
1390 | } | |
1391 | ||
1392 | if (dgs) { | |
45bb912b | 1393 | drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); |
b411b363 PR |
1394 | if (memcmp(dig_in, dig_vv, dgs)) { |
1395 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
1396 | return 0; | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | D_ASSERT(data_size == 0); | |
1401 | return 1; | |
1402 | } | |
1403 | ||
1404 | /* e_end_resync_block() is called via | |
1405 | * drbd_process_done_ee() by asender only */ | |
1406 | static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1407 | { | |
1408 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1409 | sector_t sector = e->sector; | |
1410 | int ok; | |
1411 | ||
1412 | D_ASSERT(hlist_unhashed(&e->colision)); | |
1413 | ||
45bb912b | 1414 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1415 | drbd_set_in_sync(mdev, sector, e->size); |
1416 | ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); | |
1417 | } else { | |
1418 | /* Record failure to sync */ | |
1419 | drbd_rs_failed_io(mdev, sector, e->size); | |
1420 | ||
1421 | ok = drbd_send_ack(mdev, P_NEG_ACK, e); | |
1422 | } | |
1423 | dec_unacked(mdev); | |
1424 | ||
1425 | return ok; | |
1426 | } | |
1427 | ||
1428 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1429 | { | |
1430 | struct drbd_epoch_entry *e; | |
1431 | ||
1432 | e = read_in_block(mdev, ID_SYNCER, sector, data_size); | |
45bb912b LE |
1433 | if (!e) |
1434 | goto fail; | |
b411b363 PR |
1435 | |
1436 | dec_rs_pending(mdev); | |
1437 | ||
b411b363 PR |
1438 | inc_unacked(mdev); |
1439 | /* corresponding dec_unacked() in e_end_resync_block() | |
1440 | * respective _drbd_clear_done_ee */ | |
1441 | ||
45bb912b LE |
1442 | e->w.cb = e_end_resync_block; |
1443 | ||
b411b363 PR |
1444 | spin_lock_irq(&mdev->req_lock); |
1445 | list_add(&e->w.list, &mdev->sync_ee); | |
1446 | spin_unlock_irq(&mdev->req_lock); | |
1447 | ||
0f0601f4 | 1448 | atomic_add(data_size >> 9, &mdev->rs_sect_ev); |
45bb912b LE |
1449 | if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) |
1450 | return TRUE; | |
b411b363 | 1451 | |
22cc37a9 LE |
1452 | /* drbd_submit_ee currently fails for one reason only: |
1453 | * not being able to allocate enough bios. | |
1454 | * Is dropping the connection going to help? */ | |
1455 | spin_lock_irq(&mdev->req_lock); | |
1456 | list_del(&e->w.list); | |
1457 | spin_unlock_irq(&mdev->req_lock); | |
1458 | ||
45bb912b LE |
1459 | drbd_free_ee(mdev, e); |
1460 | fail: | |
1461 | put_ldev(mdev); | |
1462 | return FALSE; | |
b411b363 PR |
1463 | } |
1464 | ||
02918be2 | 1465 | static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 PR |
1466 | { |
1467 | struct drbd_request *req; | |
1468 | sector_t sector; | |
b411b363 | 1469 | int ok; |
02918be2 | 1470 | struct p_data *p = &mdev->data.rbuf.data; |
b411b363 PR |
1471 | |
1472 | sector = be64_to_cpu(p->sector); | |
1473 | ||
1474 | spin_lock_irq(&mdev->req_lock); | |
1475 | req = _ar_id_to_req(mdev, p->block_id, sector); | |
1476 | spin_unlock_irq(&mdev->req_lock); | |
1477 | if (unlikely(!req)) { | |
1478 | dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); | |
1479 | return FALSE; | |
1480 | } | |
1481 | ||
1482 | /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid | |
1483 | * special casing it there for the various failure cases. | |
1484 | * still no race with drbd_fail_pending_reads */ | |
1485 | ok = recv_dless_read(mdev, req, sector, data_size); | |
1486 | ||
1487 | if (ok) | |
1488 | req_mod(req, data_received); | |
1489 | /* else: nothing. handled from drbd_disconnect... | |
1490 | * I don't think we may complete this just yet | |
1491 | * in case we are "on-disconnect: freeze" */ | |
1492 | ||
1493 | return ok; | |
1494 | } | |
1495 | ||
02918be2 | 1496 | static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 PR |
1497 | { |
1498 | sector_t sector; | |
b411b363 | 1499 | int ok; |
02918be2 | 1500 | struct p_data *p = &mdev->data.rbuf.data; |
b411b363 PR |
1501 | |
1502 | sector = be64_to_cpu(p->sector); | |
1503 | D_ASSERT(p->block_id == ID_SYNCER); | |
1504 | ||
1505 | if (get_ldev(mdev)) { | |
1506 | /* data is submitted to disk within recv_resync_read. | |
1507 | * corresponding put_ldev done below on error, | |
1508 | * or in drbd_endio_write_sec. */ | |
1509 | ok = recv_resync_read(mdev, sector, data_size); | |
1510 | } else { | |
1511 | if (__ratelimit(&drbd_ratelimit_state)) | |
1512 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1513 | ||
1514 | ok = drbd_drain_block(mdev, data_size); | |
1515 | ||
2b2bf214 | 1516 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); |
b411b363 PR |
1517 | } |
1518 | ||
778f271d PR |
1519 | atomic_add(data_size >> 9, &mdev->rs_sect_in); |
1520 | ||
b411b363 PR |
1521 | return ok; |
1522 | } | |
1523 | ||
1524 | /* e_end_block() is called via drbd_process_done_ee(). | |
1525 | * this means this function only runs in the asender thread | |
1526 | */ | |
1527 | static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1528 | { | |
1529 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1530 | sector_t sector = e->sector; | |
b411b363 PR |
1531 | int ok = 1, pcmd; |
1532 | ||
b411b363 | 1533 | if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { |
45bb912b | 1534 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1535 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
1536 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
1537 | e->flags & EE_MAY_SET_IN_SYNC) ? | |
1538 | P_RS_WRITE_ACK : P_WRITE_ACK; | |
1539 | ok &= drbd_send_ack(mdev, pcmd, e); | |
1540 | if (pcmd == P_RS_WRITE_ACK) | |
1541 | drbd_set_in_sync(mdev, sector, e->size); | |
1542 | } else { | |
1543 | ok = drbd_send_ack(mdev, P_NEG_ACK, e); | |
1544 | /* we expect it to be marked out of sync anyways... | |
1545 | * maybe assert this? */ | |
1546 | } | |
1547 | dec_unacked(mdev); | |
1548 | } | |
1549 | /* we delete from the conflict detection hash _after_ we sent out the | |
1550 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
1551 | if (mdev->net_conf->two_primaries) { | |
1552 | spin_lock_irq(&mdev->req_lock); | |
1553 | D_ASSERT(!hlist_unhashed(&e->colision)); | |
1554 | hlist_del_init(&e->colision); | |
1555 | spin_unlock_irq(&mdev->req_lock); | |
1556 | } else { | |
1557 | D_ASSERT(hlist_unhashed(&e->colision)); | |
1558 | } | |
1559 | ||
1560 | drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); | |
1561 | ||
1562 | return ok; | |
1563 | } | |
1564 | ||
1565 | static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1566 | { | |
1567 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1568 | int ok = 1; | |
1569 | ||
1570 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
1571 | ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); | |
1572 | ||
1573 | spin_lock_irq(&mdev->req_lock); | |
1574 | D_ASSERT(!hlist_unhashed(&e->colision)); | |
1575 | hlist_del_init(&e->colision); | |
1576 | spin_unlock_irq(&mdev->req_lock); | |
1577 | ||
1578 | dec_unacked(mdev); | |
1579 | ||
1580 | return ok; | |
1581 | } | |
1582 | ||
1583 | /* Called from receive_Data. | |
1584 | * Synchronize packets on sock with packets on msock. | |
1585 | * | |
1586 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1587 | * packet traveling on msock, they are still processed in the order they have | |
1588 | * been sent. | |
1589 | * | |
1590 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1591 | * | |
1592 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1593 | * outstanding packets on the msock. We wait for them to arrive. | |
1594 | * In case we are the logically next packet, we update mdev->peer_seq | |
1595 | * ourselves. Correctly handles 32bit wrap around. | |
1596 | * | |
1597 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1598 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1599 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1600 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1601 | * | |
1602 | * returns 0 if we may process the packet, | |
1603 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
1604 | static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) | |
1605 | { | |
1606 | DEFINE_WAIT(wait); | |
1607 | unsigned int p_seq; | |
1608 | long timeout; | |
1609 | int ret = 0; | |
1610 | spin_lock(&mdev->peer_seq_lock); | |
1611 | for (;;) { | |
1612 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); | |
1613 | if (seq_le(packet_seq, mdev->peer_seq+1)) | |
1614 | break; | |
1615 | if (signal_pending(current)) { | |
1616 | ret = -ERESTARTSYS; | |
1617 | break; | |
1618 | } | |
1619 | p_seq = mdev->peer_seq; | |
1620 | spin_unlock(&mdev->peer_seq_lock); | |
1621 | timeout = schedule_timeout(30*HZ); | |
1622 | spin_lock(&mdev->peer_seq_lock); | |
1623 | if (timeout == 0 && p_seq == mdev->peer_seq) { | |
1624 | ret = -ETIMEDOUT; | |
1625 | dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); | |
1626 | break; | |
1627 | } | |
1628 | } | |
1629 | finish_wait(&mdev->seq_wait, &wait); | |
1630 | if (mdev->peer_seq+1 == packet_seq) | |
1631 | mdev->peer_seq++; | |
1632 | spin_unlock(&mdev->peer_seq_lock); | |
1633 | return ret; | |
1634 | } | |
1635 | ||
76d2e7ec PR |
1636 | static unsigned long write_flags_to_bio(struct drbd_conf *mdev, u32 dpf) |
1637 | { | |
1638 | if (mdev->agreed_pro_version >= 95) | |
1639 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | | |
1640 | (dpf & DP_UNPLUG ? REQ_UNPLUG : 0) | | |
1641 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
1642 | (dpf & DP_FLUSH ? REQ_FUA : 0) | | |
1643 | (dpf & DP_DISCARD ? REQ_DISCARD : 0); | |
1644 | else | |
1645 | return dpf & DP_RW_SYNC ? (REQ_SYNC | REQ_UNPLUG) : 0; | |
1646 | } | |
1647 | ||
b411b363 | 1648 | /* mirrored write */ |
02918be2 | 1649 | static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 PR |
1650 | { |
1651 | sector_t sector; | |
1652 | struct drbd_epoch_entry *e; | |
02918be2 | 1653 | struct p_data *p = &mdev->data.rbuf.data; |
b411b363 PR |
1654 | int rw = WRITE; |
1655 | u32 dp_flags; | |
1656 | ||
b411b363 PR |
1657 | if (!get_ldev(mdev)) { |
1658 | if (__ratelimit(&drbd_ratelimit_state)) | |
1659 | dev_err(DEV, "Can not write mirrored data block " | |
1660 | "to local disk.\n"); | |
1661 | spin_lock(&mdev->peer_seq_lock); | |
1662 | if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) | |
1663 | mdev->peer_seq++; | |
1664 | spin_unlock(&mdev->peer_seq_lock); | |
1665 | ||
2b2bf214 | 1666 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); |
b411b363 PR |
1667 | atomic_inc(&mdev->current_epoch->epoch_size); |
1668 | return drbd_drain_block(mdev, data_size); | |
1669 | } | |
1670 | ||
1671 | /* get_ldev(mdev) successful. | |
1672 | * Corresponding put_ldev done either below (on various errors), | |
1673 | * or in drbd_endio_write_sec, if we successfully submit the data at | |
1674 | * the end of this function. */ | |
1675 | ||
1676 | sector = be64_to_cpu(p->sector); | |
1677 | e = read_in_block(mdev, p->block_id, sector, data_size); | |
1678 | if (!e) { | |
1679 | put_ldev(mdev); | |
1680 | return FALSE; | |
1681 | } | |
1682 | ||
b411b363 PR |
1683 | e->w.cb = e_end_block; |
1684 | ||
1685 | spin_lock(&mdev->epoch_lock); | |
1686 | e->epoch = mdev->current_epoch; | |
1687 | atomic_inc(&e->epoch->epoch_size); | |
1688 | atomic_inc(&e->epoch->active); | |
b411b363 PR |
1689 | spin_unlock(&mdev->epoch_lock); |
1690 | ||
1691 | dp_flags = be32_to_cpu(p->dp_flags); | |
76d2e7ec PR |
1692 | rw |= write_flags_to_bio(mdev, dp_flags); |
1693 | ||
b411b363 PR |
1694 | if (dp_flags & DP_MAY_SET_IN_SYNC) |
1695 | e->flags |= EE_MAY_SET_IN_SYNC; | |
1696 | ||
1697 | /* I'm the receiver, I do hold a net_cnt reference. */ | |
1698 | if (!mdev->net_conf->two_primaries) { | |
1699 | spin_lock_irq(&mdev->req_lock); | |
1700 | } else { | |
1701 | /* don't get the req_lock yet, | |
1702 | * we may sleep in drbd_wait_peer_seq */ | |
1703 | const int size = e->size; | |
1704 | const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
1705 | DEFINE_WAIT(wait); | |
1706 | struct drbd_request *i; | |
1707 | struct hlist_node *n; | |
1708 | struct hlist_head *slot; | |
1709 | int first; | |
1710 | ||
1711 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
1712 | BUG_ON(mdev->ee_hash == NULL); | |
1713 | BUG_ON(mdev->tl_hash == NULL); | |
1714 | ||
1715 | /* conflict detection and handling: | |
1716 | * 1. wait on the sequence number, | |
1717 | * in case this data packet overtook ACK packets. | |
1718 | * 2. check our hash tables for conflicting requests. | |
1719 | * we only need to walk the tl_hash, since an ee can not | |
1720 | * have a conflict with an other ee: on the submitting | |
1721 | * node, the corresponding req had already been conflicting, | |
1722 | * and a conflicting req is never sent. | |
1723 | * | |
1724 | * Note: for two_primaries, we are protocol C, | |
1725 | * so there cannot be any request that is DONE | |
1726 | * but still on the transfer log. | |
1727 | * | |
1728 | * unconditionally add to the ee_hash. | |
1729 | * | |
1730 | * if no conflicting request is found: | |
1731 | * submit. | |
1732 | * | |
1733 | * if any conflicting request is found | |
1734 | * that has not yet been acked, | |
1735 | * AND I have the "discard concurrent writes" flag: | |
1736 | * queue (via done_ee) the P_DISCARD_ACK; OUT. | |
1737 | * | |
1738 | * if any conflicting request is found: | |
1739 | * block the receiver, waiting on misc_wait | |
1740 | * until no more conflicting requests are there, | |
1741 | * or we get interrupted (disconnect). | |
1742 | * | |
1743 | * we do not just write after local io completion of those | |
1744 | * requests, but only after req is done completely, i.e. | |
1745 | * we wait for the P_DISCARD_ACK to arrive! | |
1746 | * | |
1747 | * then proceed normally, i.e. submit. | |
1748 | */ | |
1749 | if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) | |
1750 | goto out_interrupted; | |
1751 | ||
1752 | spin_lock_irq(&mdev->req_lock); | |
1753 | ||
1754 | hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); | |
1755 | ||
1756 | #define OVERLAPS overlaps(i->sector, i->size, sector, size) | |
1757 | slot = tl_hash_slot(mdev, sector); | |
1758 | first = 1; | |
1759 | for (;;) { | |
1760 | int have_unacked = 0; | |
1761 | int have_conflict = 0; | |
1762 | prepare_to_wait(&mdev->misc_wait, &wait, | |
1763 | TASK_INTERRUPTIBLE); | |
1764 | hlist_for_each_entry(i, n, slot, colision) { | |
1765 | if (OVERLAPS) { | |
1766 | /* only ALERT on first iteration, | |
1767 | * we may be woken up early... */ | |
1768 | if (first) | |
1769 | dev_alert(DEV, "%s[%u] Concurrent local write detected!" | |
1770 | " new: %llus +%u; pending: %llus +%u\n", | |
1771 | current->comm, current->pid, | |
1772 | (unsigned long long)sector, size, | |
1773 | (unsigned long long)i->sector, i->size); | |
1774 | if (i->rq_state & RQ_NET_PENDING) | |
1775 | ++have_unacked; | |
1776 | ++have_conflict; | |
1777 | } | |
1778 | } | |
1779 | #undef OVERLAPS | |
1780 | if (!have_conflict) | |
1781 | break; | |
1782 | ||
1783 | /* Discard Ack only for the _first_ iteration */ | |
1784 | if (first && discard && have_unacked) { | |
1785 | dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", | |
1786 | (unsigned long long)sector); | |
1787 | inc_unacked(mdev); | |
1788 | e->w.cb = e_send_discard_ack; | |
1789 | list_add_tail(&e->w.list, &mdev->done_ee); | |
1790 | ||
1791 | spin_unlock_irq(&mdev->req_lock); | |
1792 | ||
1793 | /* we could probably send that P_DISCARD_ACK ourselves, | |
1794 | * but I don't like the receiver using the msock */ | |
1795 | ||
1796 | put_ldev(mdev); | |
1797 | wake_asender(mdev); | |
1798 | finish_wait(&mdev->misc_wait, &wait); | |
1799 | return TRUE; | |
1800 | } | |
1801 | ||
1802 | if (signal_pending(current)) { | |
1803 | hlist_del_init(&e->colision); | |
1804 | ||
1805 | spin_unlock_irq(&mdev->req_lock); | |
1806 | ||
1807 | finish_wait(&mdev->misc_wait, &wait); | |
1808 | goto out_interrupted; | |
1809 | } | |
1810 | ||
1811 | spin_unlock_irq(&mdev->req_lock); | |
1812 | if (first) { | |
1813 | first = 0; | |
1814 | dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " | |
1815 | "sec=%llus\n", (unsigned long long)sector); | |
1816 | } else if (discard) { | |
1817 | /* we had none on the first iteration. | |
1818 | * there must be none now. */ | |
1819 | D_ASSERT(have_unacked == 0); | |
1820 | } | |
1821 | schedule(); | |
1822 | spin_lock_irq(&mdev->req_lock); | |
1823 | } | |
1824 | finish_wait(&mdev->misc_wait, &wait); | |
1825 | } | |
1826 | ||
1827 | list_add(&e->w.list, &mdev->active_ee); | |
1828 | spin_unlock_irq(&mdev->req_lock); | |
1829 | ||
1830 | switch (mdev->net_conf->wire_protocol) { | |
1831 | case DRBD_PROT_C: | |
1832 | inc_unacked(mdev); | |
1833 | /* corresponding dec_unacked() in e_end_block() | |
1834 | * respective _drbd_clear_done_ee */ | |
1835 | break; | |
1836 | case DRBD_PROT_B: | |
1837 | /* I really don't like it that the receiver thread | |
1838 | * sends on the msock, but anyways */ | |
1839 | drbd_send_ack(mdev, P_RECV_ACK, e); | |
1840 | break; | |
1841 | case DRBD_PROT_A: | |
1842 | /* nothing to do */ | |
1843 | break; | |
1844 | } | |
1845 | ||
6719fb03 | 1846 | if (mdev->state.pdsk < D_INCONSISTENT) { |
b411b363 PR |
1847 | /* In case we have the only disk of the cluster, */ |
1848 | drbd_set_out_of_sync(mdev, e->sector, e->size); | |
1849 | e->flags |= EE_CALL_AL_COMPLETE_IO; | |
6719fb03 | 1850 | e->flags &= ~EE_MAY_SET_IN_SYNC; |
b411b363 PR |
1851 | drbd_al_begin_io(mdev, e->sector); |
1852 | } | |
1853 | ||
45bb912b LE |
1854 | if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) |
1855 | return TRUE; | |
b411b363 | 1856 | |
22cc37a9 LE |
1857 | /* drbd_submit_ee currently fails for one reason only: |
1858 | * not being able to allocate enough bios. | |
1859 | * Is dropping the connection going to help? */ | |
1860 | spin_lock_irq(&mdev->req_lock); | |
1861 | list_del(&e->w.list); | |
1862 | hlist_del_init(&e->colision); | |
1863 | spin_unlock_irq(&mdev->req_lock); | |
1864 | if (e->flags & EE_CALL_AL_COMPLETE_IO) | |
1865 | drbd_al_complete_io(mdev, e->sector); | |
1866 | ||
b411b363 PR |
1867 | out_interrupted: |
1868 | /* yes, the epoch_size now is imbalanced. | |
1869 | * but we drop the connection anyways, so we don't have a chance to | |
1870 | * receive a barrier... atomic_inc(&mdev->epoch_size); */ | |
1871 | put_ldev(mdev); | |
1872 | drbd_free_ee(mdev, e); | |
1873 | return FALSE; | |
1874 | } | |
1875 | ||
0f0601f4 LE |
1876 | /* We may throttle resync, if the lower device seems to be busy, |
1877 | * and current sync rate is above c_min_rate. | |
1878 | * | |
1879 | * To decide whether or not the lower device is busy, we use a scheme similar | |
1880 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
1881 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
1882 | * activity, it obviously is "busy". | |
1883 | * | |
1884 | * The current sync rate used here uses only the most recent two step marks, | |
1885 | * to have a short time average so we can react faster. | |
1886 | */ | |
1887 | int drbd_rs_should_slow_down(struct drbd_conf *mdev) | |
1888 | { | |
1889 | struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; | |
1890 | unsigned long db, dt, dbdt; | |
1891 | int curr_events; | |
1892 | int throttle = 0; | |
1893 | ||
1894 | /* feature disabled? */ | |
1895 | if (mdev->sync_conf.c_min_rate == 0) | |
1896 | return 0; | |
1897 | ||
1898 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + | |
1899 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
1900 | atomic_read(&mdev->rs_sect_ev); | |
1901 | if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { | |
1902 | unsigned long rs_left; | |
1903 | int i; | |
1904 | ||
1905 | mdev->rs_last_events = curr_events; | |
1906 | ||
1907 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
1908 | * approx. */ | |
1909 | i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-2) % DRBD_SYNC_MARKS; | |
1910 | rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; | |
1911 | ||
1912 | dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; | |
1913 | if (!dt) | |
1914 | dt++; | |
1915 | db = mdev->rs_mark_left[i] - rs_left; | |
1916 | dbdt = Bit2KB(db/dt); | |
1917 | ||
1918 | if (dbdt > mdev->sync_conf.c_min_rate) | |
1919 | throttle = 1; | |
1920 | } | |
1921 | return throttle; | |
1922 | } | |
1923 | ||
1924 | ||
02918be2 | 1925 | static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size) |
b411b363 PR |
1926 | { |
1927 | sector_t sector; | |
1928 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1929 | struct drbd_epoch_entry *e; | |
1930 | struct digest_info *di = NULL; | |
b18b37be | 1931 | int size, verb; |
b411b363 | 1932 | unsigned int fault_type; |
02918be2 | 1933 | struct p_block_req *p = &mdev->data.rbuf.block_req; |
b411b363 PR |
1934 | |
1935 | sector = be64_to_cpu(p->sector); | |
1936 | size = be32_to_cpu(p->blksize); | |
1937 | ||
1938 | if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) { | |
1939 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
1940 | (unsigned long long)sector, size); | |
1941 | return FALSE; | |
1942 | } | |
1943 | if (sector + (size>>9) > capacity) { | |
1944 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
1945 | (unsigned long long)sector, size); | |
1946 | return FALSE; | |
1947 | } | |
1948 | ||
1949 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
b18b37be PR |
1950 | verb = 1; |
1951 | switch (cmd) { | |
1952 | case P_DATA_REQUEST: | |
1953 | drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); | |
1954 | break; | |
1955 | case P_RS_DATA_REQUEST: | |
1956 | case P_CSUM_RS_REQUEST: | |
1957 | case P_OV_REQUEST: | |
1958 | drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); | |
1959 | break; | |
1960 | case P_OV_REPLY: | |
1961 | verb = 0; | |
1962 | dec_rs_pending(mdev); | |
1963 | drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); | |
1964 | break; | |
1965 | default: | |
1966 | dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", | |
1967 | cmdname(cmd)); | |
1968 | } | |
1969 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
b411b363 PR |
1970 | dev_err(DEV, "Can not satisfy peer's read request, " |
1971 | "no local data.\n"); | |
b18b37be | 1972 | |
a821cc4a LE |
1973 | /* drain possibly payload */ |
1974 | return drbd_drain_block(mdev, digest_size); | |
b411b363 PR |
1975 | } |
1976 | ||
1977 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
1978 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1979 | * which in turn might block on the other node at this very place. */ | |
1980 | e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); | |
1981 | if (!e) { | |
1982 | put_ldev(mdev); | |
1983 | return FALSE; | |
1984 | } | |
1985 | ||
02918be2 | 1986 | switch (cmd) { |
b411b363 PR |
1987 | case P_DATA_REQUEST: |
1988 | e->w.cb = w_e_end_data_req; | |
1989 | fault_type = DRBD_FAULT_DT_RD; | |
80a40e43 LE |
1990 | /* application IO, don't drbd_rs_begin_io */ |
1991 | goto submit; | |
1992 | ||
b411b363 PR |
1993 | case P_RS_DATA_REQUEST: |
1994 | e->w.cb = w_e_end_rsdata_req; | |
1995 | fault_type = DRBD_FAULT_RS_RD; | |
b411b363 PR |
1996 | break; |
1997 | ||
1998 | case P_OV_REPLY: | |
1999 | case P_CSUM_RS_REQUEST: | |
2000 | fault_type = DRBD_FAULT_RS_RD; | |
b411b363 PR |
2001 | di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); |
2002 | if (!di) | |
2003 | goto out_free_e; | |
2004 | ||
2005 | di->digest_size = digest_size; | |
2006 | di->digest = (((char *)di)+sizeof(struct digest_info)); | |
2007 | ||
c36c3ced LE |
2008 | e->digest = di; |
2009 | e->flags |= EE_HAS_DIGEST; | |
2010 | ||
b411b363 PR |
2011 | if (drbd_recv(mdev, di->digest, digest_size) != digest_size) |
2012 | goto out_free_e; | |
2013 | ||
02918be2 | 2014 | if (cmd == P_CSUM_RS_REQUEST) { |
b411b363 PR |
2015 | D_ASSERT(mdev->agreed_pro_version >= 89); |
2016 | e->w.cb = w_e_end_csum_rs_req; | |
02918be2 | 2017 | } else if (cmd == P_OV_REPLY) { |
b411b363 PR |
2018 | e->w.cb = w_e_end_ov_reply; |
2019 | dec_rs_pending(mdev); | |
0f0601f4 LE |
2020 | /* drbd_rs_begin_io done when we sent this request, |
2021 | * but accounting still needs to be done. */ | |
2022 | goto submit_for_resync; | |
b411b363 PR |
2023 | } |
2024 | break; | |
2025 | ||
2026 | case P_OV_REQUEST: | |
b411b363 PR |
2027 | if (mdev->ov_start_sector == ~(sector_t)0 && |
2028 | mdev->agreed_pro_version >= 90) { | |
2029 | mdev->ov_start_sector = sector; | |
2030 | mdev->ov_position = sector; | |
2031 | mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector); | |
2032 | dev_info(DEV, "Online Verify start sector: %llu\n", | |
2033 | (unsigned long long)sector); | |
2034 | } | |
2035 | e->w.cb = w_e_end_ov_req; | |
2036 | fault_type = DRBD_FAULT_RS_RD; | |
b411b363 PR |
2037 | break; |
2038 | ||
b411b363 PR |
2039 | default: |
2040 | dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", | |
02918be2 | 2041 | cmdname(cmd)); |
b411b363 | 2042 | fault_type = DRBD_FAULT_MAX; |
80a40e43 | 2043 | goto out_free_e; |
b411b363 PR |
2044 | } |
2045 | ||
0f0601f4 LE |
2046 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2047 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2048 | * Various places in the resync start and stop logic assume resync | |
2049 | * requests are processed in order, requeuing this on the worker thread | |
2050 | * introduces a bunch of new code for synchronization between threads. | |
2051 | * | |
2052 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2053 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2054 | * for application writes for the same time. For now, just throttle | |
2055 | * here, where the rest of the code expects the receiver to sleep for | |
2056 | * a while, anyways. | |
2057 | */ | |
2058 | ||
2059 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2060 | * this defers syncer requests for some time, before letting at least | |
2061 | * on request through. The resync controller on the receiving side | |
2062 | * will adapt to the incoming rate accordingly. | |
2063 | * | |
2064 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2065 | * we would also throttle its application reads. | |
2066 | * In that case, throttling is done on the SyncTarget only. | |
2067 | */ | |
2068 | if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev)) | |
2069 | msleep(100); | |
80a40e43 LE |
2070 | if (drbd_rs_begin_io(mdev, e->sector)) |
2071 | goto out_free_e; | |
b411b363 | 2072 | |
0f0601f4 LE |
2073 | submit_for_resync: |
2074 | atomic_add(size >> 9, &mdev->rs_sect_ev); | |
2075 | ||
80a40e43 | 2076 | submit: |
b411b363 | 2077 | inc_unacked(mdev); |
80a40e43 LE |
2078 | spin_lock_irq(&mdev->req_lock); |
2079 | list_add_tail(&e->w.list, &mdev->read_ee); | |
2080 | spin_unlock_irq(&mdev->req_lock); | |
b411b363 | 2081 | |
45bb912b LE |
2082 | if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) |
2083 | return TRUE; | |
b411b363 | 2084 | |
22cc37a9 LE |
2085 | /* drbd_submit_ee currently fails for one reason only: |
2086 | * not being able to allocate enough bios. | |
2087 | * Is dropping the connection going to help? */ | |
2088 | spin_lock_irq(&mdev->req_lock); | |
2089 | list_del(&e->w.list); | |
2090 | spin_unlock_irq(&mdev->req_lock); | |
2091 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ | |
2092 | ||
b411b363 | 2093 | out_free_e: |
b411b363 PR |
2094 | put_ldev(mdev); |
2095 | drbd_free_ee(mdev, e); | |
2096 | return FALSE; | |
2097 | } | |
2098 | ||
2099 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2100 | { | |
2101 | int self, peer, rv = -100; | |
2102 | unsigned long ch_self, ch_peer; | |
2103 | ||
2104 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2105 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2106 | ||
2107 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2108 | ch_self = mdev->comm_bm_set; | |
2109 | ||
2110 | switch (mdev->net_conf->after_sb_0p) { | |
2111 | case ASB_CONSENSUS: | |
2112 | case ASB_DISCARD_SECONDARY: | |
2113 | case ASB_CALL_HELPER: | |
2114 | dev_err(DEV, "Configuration error.\n"); | |
2115 | break; | |
2116 | case ASB_DISCONNECT: | |
2117 | break; | |
2118 | case ASB_DISCARD_YOUNGER_PRI: | |
2119 | if (self == 0 && peer == 1) { | |
2120 | rv = -1; | |
2121 | break; | |
2122 | } | |
2123 | if (self == 1 && peer == 0) { | |
2124 | rv = 1; | |
2125 | break; | |
2126 | } | |
2127 | /* Else fall through to one of the other strategies... */ | |
2128 | case ASB_DISCARD_OLDER_PRI: | |
2129 | if (self == 0 && peer == 1) { | |
2130 | rv = 1; | |
2131 | break; | |
2132 | } | |
2133 | if (self == 1 && peer == 0) { | |
2134 | rv = -1; | |
2135 | break; | |
2136 | } | |
2137 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2138 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2139 | "Using discard-least-changes instead\n"); |
2140 | case ASB_DISCARD_ZERO_CHG: | |
2141 | if (ch_peer == 0 && ch_self == 0) { | |
2142 | rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) | |
2143 | ? -1 : 1; | |
2144 | break; | |
2145 | } else { | |
2146 | if (ch_peer == 0) { rv = 1; break; } | |
2147 | if (ch_self == 0) { rv = -1; break; } | |
2148 | } | |
2149 | if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) | |
2150 | break; | |
2151 | case ASB_DISCARD_LEAST_CHG: | |
2152 | if (ch_self < ch_peer) | |
2153 | rv = -1; | |
2154 | else if (ch_self > ch_peer) | |
2155 | rv = 1; | |
2156 | else /* ( ch_self == ch_peer ) */ | |
2157 | /* Well, then use something else. */ | |
2158 | rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) | |
2159 | ? -1 : 1; | |
2160 | break; | |
2161 | case ASB_DISCARD_LOCAL: | |
2162 | rv = -1; | |
2163 | break; | |
2164 | case ASB_DISCARD_REMOTE: | |
2165 | rv = 1; | |
2166 | } | |
2167 | ||
2168 | return rv; | |
2169 | } | |
2170 | ||
2171 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2172 | { | |
2173 | int self, peer, hg, rv = -100; | |
2174 | ||
2175 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2176 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2177 | ||
2178 | switch (mdev->net_conf->after_sb_1p) { | |
2179 | case ASB_DISCARD_YOUNGER_PRI: | |
2180 | case ASB_DISCARD_OLDER_PRI: | |
2181 | case ASB_DISCARD_LEAST_CHG: | |
2182 | case ASB_DISCARD_LOCAL: | |
2183 | case ASB_DISCARD_REMOTE: | |
2184 | dev_err(DEV, "Configuration error.\n"); | |
2185 | break; | |
2186 | case ASB_DISCONNECT: | |
2187 | break; | |
2188 | case ASB_CONSENSUS: | |
2189 | hg = drbd_asb_recover_0p(mdev); | |
2190 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2191 | rv = hg; | |
2192 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2193 | rv = hg; | |
2194 | break; | |
2195 | case ASB_VIOLENTLY: | |
2196 | rv = drbd_asb_recover_0p(mdev); | |
2197 | break; | |
2198 | case ASB_DISCARD_SECONDARY: | |
2199 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2200 | case ASB_CALL_HELPER: | |
2201 | hg = drbd_asb_recover_0p(mdev); | |
2202 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
2203 | self = drbd_set_role(mdev, R_SECONDARY, 0); | |
2204 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, | |
2205 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2206 | * we do not need to wait for the after state change work either. */ | |
2207 | self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); | |
2208 | if (self != SS_SUCCESS) { | |
2209 | drbd_khelper(mdev, "pri-lost-after-sb"); | |
2210 | } else { | |
2211 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2212 | rv = hg; | |
2213 | } | |
2214 | } else | |
2215 | rv = hg; | |
2216 | } | |
2217 | ||
2218 | return rv; | |
2219 | } | |
2220 | ||
2221 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2222 | { | |
2223 | int self, peer, hg, rv = -100; | |
2224 | ||
2225 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2226 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2227 | ||
2228 | switch (mdev->net_conf->after_sb_2p) { | |
2229 | case ASB_DISCARD_YOUNGER_PRI: | |
2230 | case ASB_DISCARD_OLDER_PRI: | |
2231 | case ASB_DISCARD_LEAST_CHG: | |
2232 | case ASB_DISCARD_LOCAL: | |
2233 | case ASB_DISCARD_REMOTE: | |
2234 | case ASB_CONSENSUS: | |
2235 | case ASB_DISCARD_SECONDARY: | |
2236 | dev_err(DEV, "Configuration error.\n"); | |
2237 | break; | |
2238 | case ASB_VIOLENTLY: | |
2239 | rv = drbd_asb_recover_0p(mdev); | |
2240 | break; | |
2241 | case ASB_DISCONNECT: | |
2242 | break; | |
2243 | case ASB_CALL_HELPER: | |
2244 | hg = drbd_asb_recover_0p(mdev); | |
2245 | if (hg == -1) { | |
2246 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, | |
2247 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2248 | * we do not need to wait for the after state change work either. */ | |
2249 | self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); | |
2250 | if (self != SS_SUCCESS) { | |
2251 | drbd_khelper(mdev, "pri-lost-after-sb"); | |
2252 | } else { | |
2253 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2254 | rv = hg; | |
2255 | } | |
2256 | } else | |
2257 | rv = hg; | |
2258 | } | |
2259 | ||
2260 | return rv; | |
2261 | } | |
2262 | ||
2263 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2264 | u64 bits, u64 flags) | |
2265 | { | |
2266 | if (!uuid) { | |
2267 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2268 | return; | |
2269 | } | |
2270 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2271 | text, | |
2272 | (unsigned long long)uuid[UI_CURRENT], | |
2273 | (unsigned long long)uuid[UI_BITMAP], | |
2274 | (unsigned long long)uuid[UI_HISTORY_START], | |
2275 | (unsigned long long)uuid[UI_HISTORY_END], | |
2276 | (unsigned long long)bits, | |
2277 | (unsigned long long)flags); | |
2278 | } | |
2279 | ||
2280 | /* | |
2281 | 100 after split brain try auto recover | |
2282 | 2 C_SYNC_SOURCE set BitMap | |
2283 | 1 C_SYNC_SOURCE use BitMap | |
2284 | 0 no Sync | |
2285 | -1 C_SYNC_TARGET use BitMap | |
2286 | -2 C_SYNC_TARGET set BitMap | |
2287 | -100 after split brain, disconnect | |
2288 | -1000 unrelated data | |
2289 | */ | |
2290 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2291 | { | |
2292 | u64 self, peer; | |
2293 | int i, j; | |
2294 | ||
2295 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2296 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2297 | ||
2298 | *rule_nr = 10; | |
2299 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2300 | return 0; | |
2301 | ||
2302 | *rule_nr = 20; | |
2303 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2304 | peer != UUID_JUST_CREATED) | |
2305 | return -2; | |
2306 | ||
2307 | *rule_nr = 30; | |
2308 | if (self != UUID_JUST_CREATED && | |
2309 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2310 | return 2; | |
2311 | ||
2312 | if (self == peer) { | |
2313 | int rct, dc; /* roles at crash time */ | |
2314 | ||
2315 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2316 | ||
2317 | if (mdev->agreed_pro_version < 91) | |
2318 | return -1001; | |
2319 | ||
2320 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2321 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2322 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2323 | drbd_uuid_set_bm(mdev, 0UL); | |
2324 | ||
2325 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2326 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2327 | *rule_nr = 34; | |
2328 | } else { | |
2329 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2330 | *rule_nr = 36; | |
2331 | } | |
2332 | ||
2333 | return 1; | |
2334 | } | |
2335 | ||
2336 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2337 | ||
2338 | if (mdev->agreed_pro_version < 91) | |
2339 | return -1001; | |
2340 | ||
2341 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2342 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2343 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2344 | ||
2345 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2346 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2347 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2348 | ||
2349 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2350 | *rule_nr = 35; | |
2351 | } else { | |
2352 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2353 | *rule_nr = 37; | |
2354 | } | |
2355 | ||
2356 | return -1; | |
2357 | } | |
2358 | ||
2359 | /* Common power [off|failure] */ | |
2360 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2361 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2362 | /* lowest bit is set when we were primary, | |
2363 | * next bit (weight 2) is set when peer was primary */ | |
2364 | *rule_nr = 40; | |
2365 | ||
2366 | switch (rct) { | |
2367 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2368 | case 1: /* self_pri && !peer_pri */ return 1; | |
2369 | case 2: /* !self_pri && peer_pri */ return -1; | |
2370 | case 3: /* self_pri && peer_pri */ | |
2371 | dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
2372 | return dc ? -1 : 1; | |
2373 | } | |
2374 | } | |
2375 | ||
2376 | *rule_nr = 50; | |
2377 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2378 | if (self == peer) | |
2379 | return -1; | |
2380 | ||
2381 | *rule_nr = 51; | |
2382 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2383 | if (self == peer) { | |
2384 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2385 | peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); | |
2386 | if (self == peer) { | |
2387 | /* The last P_SYNC_UUID did not get though. Undo the last start of | |
2388 | resync as sync source modifications of the peer's UUIDs. */ | |
2389 | ||
2390 | if (mdev->agreed_pro_version < 91) | |
2391 | return -1001; | |
2392 | ||
2393 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2394 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
2395 | return -1; | |
2396 | } | |
2397 | } | |
2398 | ||
2399 | *rule_nr = 60; | |
2400 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2401 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2402 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2403 | if (self == peer) | |
2404 | return -2; | |
2405 | } | |
2406 | ||
2407 | *rule_nr = 70; | |
2408 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2409 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2410 | if (self == peer) | |
2411 | return 1; | |
2412 | ||
2413 | *rule_nr = 71; | |
2414 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2415 | if (self == peer) { | |
2416 | self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); | |
2417 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2418 | if (self == peer) { | |
2419 | /* The last P_SYNC_UUID did not get though. Undo the last start of | |
2420 | resync as sync source modifications of our UUIDs. */ | |
2421 | ||
2422 | if (mdev->agreed_pro_version < 91) | |
2423 | return -1001; | |
2424 | ||
2425 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2426 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2427 | ||
2428 | dev_info(DEV, "Undid last start of resync:\n"); | |
2429 | ||
2430 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2431 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2432 | ||
2433 | return 1; | |
2434 | } | |
2435 | } | |
2436 | ||
2437 | ||
2438 | *rule_nr = 80; | |
d8c2a36b | 2439 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2440 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2441 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2442 | if (self == peer) | |
2443 | return 2; | |
2444 | } | |
2445 | ||
2446 | *rule_nr = 90; | |
2447 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2448 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2449 | if (self == peer && self != ((u64)0)) | |
2450 | return 100; | |
2451 | ||
2452 | *rule_nr = 100; | |
2453 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2454 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2455 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2456 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2457 | if (self == peer) | |
2458 | return -100; | |
2459 | } | |
2460 | } | |
2461 | ||
2462 | return -1000; | |
2463 | } | |
2464 | ||
2465 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2466 | CONN_MASK (-1) on failure. | |
2467 | */ | |
2468 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2469 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2470 | { | |
2471 | int hg, rule_nr; | |
2472 | enum drbd_conns rv = C_MASK; | |
2473 | enum drbd_disk_state mydisk; | |
2474 | ||
2475 | mydisk = mdev->state.disk; | |
2476 | if (mydisk == D_NEGOTIATING) | |
2477 | mydisk = mdev->new_state_tmp.disk; | |
2478 | ||
2479 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2480 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2481 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2482 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2483 | ||
2484 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2485 | ||
2486 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2487 | ||
2488 | if (hg == -1000) { | |
2489 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2490 | return C_MASK; | |
2491 | } | |
2492 | if (hg == -1001) { | |
2493 | dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); | |
2494 | return C_MASK; | |
2495 | } | |
2496 | ||
2497 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2498 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2499 | int f = (hg == -100) || abs(hg) == 2; | |
2500 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2501 | if (f) | |
2502 | hg = hg*2; | |
2503 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2504 | hg > 0 ? "source" : "target"); | |
2505 | } | |
2506 | ||
3a11a487 AG |
2507 | if (abs(hg) == 100) |
2508 | drbd_khelper(mdev, "initial-split-brain"); | |
2509 | ||
b411b363 PR |
2510 | if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { |
2511 | int pcount = (mdev->state.role == R_PRIMARY) | |
2512 | + (peer_role == R_PRIMARY); | |
2513 | int forced = (hg == -100); | |
2514 | ||
2515 | switch (pcount) { | |
2516 | case 0: | |
2517 | hg = drbd_asb_recover_0p(mdev); | |
2518 | break; | |
2519 | case 1: | |
2520 | hg = drbd_asb_recover_1p(mdev); | |
2521 | break; | |
2522 | case 2: | |
2523 | hg = drbd_asb_recover_2p(mdev); | |
2524 | break; | |
2525 | } | |
2526 | if (abs(hg) < 100) { | |
2527 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
2528 | "automatically solved. Sync from %s node\n", | |
2529 | pcount, (hg < 0) ? "peer" : "this"); | |
2530 | if (forced) { | |
2531 | dev_warn(DEV, "Doing a full sync, since" | |
2532 | " UUIDs where ambiguous.\n"); | |
2533 | hg = hg*2; | |
2534 | } | |
2535 | } | |
2536 | } | |
2537 | ||
2538 | if (hg == -100) { | |
2539 | if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) | |
2540 | hg = -1; | |
2541 | if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) | |
2542 | hg = 1; | |
2543 | ||
2544 | if (abs(hg) < 100) | |
2545 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
2546 | "Sync from %s node\n", | |
2547 | (hg < 0) ? "peer" : "this"); | |
2548 | } | |
2549 | ||
2550 | if (hg == -100) { | |
580b9767 LE |
2551 | /* FIXME this log message is not correct if we end up here |
2552 | * after an attempted attach on a diskless node. | |
2553 | * We just refuse to attach -- well, we drop the "connection" | |
2554 | * to that disk, in a way... */ | |
3a11a487 | 2555 | dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
b411b363 PR |
2556 | drbd_khelper(mdev, "split-brain"); |
2557 | return C_MASK; | |
2558 | } | |
2559 | ||
2560 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
2561 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
2562 | return C_MASK; | |
2563 | } | |
2564 | ||
2565 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
2566 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
2567 | switch (mdev->net_conf->rr_conflict) { | |
2568 | case ASB_CALL_HELPER: | |
2569 | drbd_khelper(mdev, "pri-lost"); | |
2570 | /* fall through */ | |
2571 | case ASB_DISCONNECT: | |
2572 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
2573 | return C_MASK; | |
2574 | case ASB_VIOLENTLY: | |
2575 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
2576 | "assumption\n"); | |
2577 | } | |
2578 | } | |
2579 | ||
cf14c2e9 PR |
2580 | if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { |
2581 | if (hg == 0) | |
2582 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
2583 | else | |
2584 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
2585 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
2586 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
2587 | return C_MASK; | |
2588 | } | |
2589 | ||
b411b363 PR |
2590 | if (abs(hg) >= 2) { |
2591 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
2592 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) | |
2593 | return C_MASK; | |
2594 | } | |
2595 | ||
2596 | if (hg > 0) { /* become sync source. */ | |
2597 | rv = C_WF_BITMAP_S; | |
2598 | } else if (hg < 0) { /* become sync target */ | |
2599 | rv = C_WF_BITMAP_T; | |
2600 | } else { | |
2601 | rv = C_CONNECTED; | |
2602 | if (drbd_bm_total_weight(mdev)) { | |
2603 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
2604 | drbd_bm_total_weight(mdev)); | |
2605 | } | |
2606 | } | |
2607 | ||
2608 | return rv; | |
2609 | } | |
2610 | ||
2611 | /* returns 1 if invalid */ | |
2612 | static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) | |
2613 | { | |
2614 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
2615 | if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || | |
2616 | (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) | |
2617 | return 0; | |
2618 | ||
2619 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
2620 | if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || | |
2621 | self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) | |
2622 | return 1; | |
2623 | ||
2624 | /* everything else is valid if they are equal on both sides. */ | |
2625 | if (peer == self) | |
2626 | return 0; | |
2627 | ||
2628 | /* everything es is invalid. */ | |
2629 | return 1; | |
2630 | } | |
2631 | ||
02918be2 | 2632 | static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 2633 | { |
02918be2 | 2634 | struct p_protocol *p = &mdev->data.rbuf.protocol; |
b411b363 | 2635 | int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
cf14c2e9 | 2636 | int p_want_lose, p_two_primaries, cf; |
b411b363 PR |
2637 | char p_integrity_alg[SHARED_SECRET_MAX] = ""; |
2638 | ||
b411b363 PR |
2639 | p_proto = be32_to_cpu(p->protocol); |
2640 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
2641 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
2642 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 2643 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 PR |
2644 | cf = be32_to_cpu(p->conn_flags); |
2645 | p_want_lose = cf & CF_WANT_LOSE; | |
2646 | ||
2647 | clear_bit(CONN_DRY_RUN, &mdev->flags); | |
2648 | ||
2649 | if (cf & CF_DRY_RUN) | |
2650 | set_bit(CONN_DRY_RUN, &mdev->flags); | |
b411b363 PR |
2651 | |
2652 | if (p_proto != mdev->net_conf->wire_protocol) { | |
2653 | dev_err(DEV, "incompatible communication protocols\n"); | |
2654 | goto disconnect; | |
2655 | } | |
2656 | ||
2657 | if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { | |
2658 | dev_err(DEV, "incompatible after-sb-0pri settings\n"); | |
2659 | goto disconnect; | |
2660 | } | |
2661 | ||
2662 | if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { | |
2663 | dev_err(DEV, "incompatible after-sb-1pri settings\n"); | |
2664 | goto disconnect; | |
2665 | } | |
2666 | ||
2667 | if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { | |
2668 | dev_err(DEV, "incompatible after-sb-2pri settings\n"); | |
2669 | goto disconnect; | |
2670 | } | |
2671 | ||
2672 | if (p_want_lose && mdev->net_conf->want_lose) { | |
2673 | dev_err(DEV, "both sides have the 'want_lose' flag set\n"); | |
2674 | goto disconnect; | |
2675 | } | |
2676 | ||
2677 | if (p_two_primaries != mdev->net_conf->two_primaries) { | |
2678 | dev_err(DEV, "incompatible setting of the two-primaries options\n"); | |
2679 | goto disconnect; | |
2680 | } | |
2681 | ||
2682 | if (mdev->agreed_pro_version >= 87) { | |
2683 | unsigned char *my_alg = mdev->net_conf->integrity_alg; | |
2684 | ||
2685 | if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) | |
2686 | return FALSE; | |
2687 | ||
2688 | p_integrity_alg[SHARED_SECRET_MAX-1] = 0; | |
2689 | if (strcmp(p_integrity_alg, my_alg)) { | |
2690 | dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); | |
2691 | goto disconnect; | |
2692 | } | |
2693 | dev_info(DEV, "data-integrity-alg: %s\n", | |
2694 | my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); | |
2695 | } | |
2696 | ||
2697 | return TRUE; | |
2698 | ||
2699 | disconnect: | |
2700 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2701 | return FALSE; | |
2702 | } | |
2703 | ||
2704 | /* helper function | |
2705 | * input: alg name, feature name | |
2706 | * return: NULL (alg name was "") | |
2707 | * ERR_PTR(error) if something goes wrong | |
2708 | * or the crypto hash ptr, if it worked out ok. */ | |
2709 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
2710 | const char *alg, const char *name) | |
2711 | { | |
2712 | struct crypto_hash *tfm; | |
2713 | ||
2714 | if (!alg[0]) | |
2715 | return NULL; | |
2716 | ||
2717 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
2718 | if (IS_ERR(tfm)) { | |
2719 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
2720 | alg, name, PTR_ERR(tfm)); | |
2721 | return tfm; | |
2722 | } | |
2723 | if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { | |
2724 | crypto_free_hash(tfm); | |
2725 | dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); | |
2726 | return ERR_PTR(-EINVAL); | |
2727 | } | |
2728 | return tfm; | |
2729 | } | |
2730 | ||
02918be2 | 2731 | static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size) |
b411b363 PR |
2732 | { |
2733 | int ok = TRUE; | |
02918be2 | 2734 | struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95; |
b411b363 PR |
2735 | unsigned int header_size, data_size, exp_max_sz; |
2736 | struct crypto_hash *verify_tfm = NULL; | |
2737 | struct crypto_hash *csums_tfm = NULL; | |
2738 | const int apv = mdev->agreed_pro_version; | |
778f271d PR |
2739 | int *rs_plan_s = NULL; |
2740 | int fifo_size = 0; | |
b411b363 PR |
2741 | |
2742 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) | |
2743 | : apv == 88 ? sizeof(struct p_rs_param) | |
2744 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
2745 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
2746 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 2747 | |
02918be2 | 2748 | if (packet_size > exp_max_sz) { |
b411b363 | 2749 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
02918be2 | 2750 | packet_size, exp_max_sz); |
b411b363 PR |
2751 | return FALSE; |
2752 | } | |
2753 | ||
2754 | if (apv <= 88) { | |
02918be2 PR |
2755 | header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80); |
2756 | data_size = packet_size - header_size; | |
8e26f9cc | 2757 | } else if (apv <= 94) { |
02918be2 PR |
2758 | header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80); |
2759 | data_size = packet_size - header_size; | |
b411b363 | 2760 | D_ASSERT(data_size == 0); |
8e26f9cc | 2761 | } else { |
02918be2 PR |
2762 | header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80); |
2763 | data_size = packet_size - header_size; | |
b411b363 PR |
2764 | D_ASSERT(data_size == 0); |
2765 | } | |
2766 | ||
2767 | /* initialize verify_alg and csums_alg */ | |
2768 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); | |
2769 | ||
02918be2 | 2770 | if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) |
b411b363 PR |
2771 | return FALSE; |
2772 | ||
2773 | mdev->sync_conf.rate = be32_to_cpu(p->rate); | |
2774 | ||
2775 | if (apv >= 88) { | |
2776 | if (apv == 88) { | |
2777 | if (data_size > SHARED_SECRET_MAX) { | |
2778 | dev_err(DEV, "verify-alg too long, " | |
2779 | "peer wants %u, accepting only %u byte\n", | |
2780 | data_size, SHARED_SECRET_MAX); | |
2781 | return FALSE; | |
2782 | } | |
2783 | ||
2784 | if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) | |
2785 | return FALSE; | |
2786 | ||
2787 | /* we expect NUL terminated string */ | |
2788 | /* but just in case someone tries to be evil */ | |
2789 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
2790 | p->verify_alg[data_size-1] = 0; | |
2791 | ||
2792 | } else /* apv >= 89 */ { | |
2793 | /* we still expect NUL terminated strings */ | |
2794 | /* but just in case someone tries to be evil */ | |
2795 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
2796 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
2797 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
2798 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
2799 | } | |
2800 | ||
2801 | if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { | |
2802 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { | |
2803 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2804 | mdev->sync_conf.verify_alg, p->verify_alg); | |
2805 | goto disconnect; | |
2806 | } | |
2807 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
2808 | p->verify_alg, "verify-alg"); | |
2809 | if (IS_ERR(verify_tfm)) { | |
2810 | verify_tfm = NULL; | |
2811 | goto disconnect; | |
2812 | } | |
2813 | } | |
2814 | ||
2815 | if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { | |
2816 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { | |
2817 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2818 | mdev->sync_conf.csums_alg, p->csums_alg); | |
2819 | goto disconnect; | |
2820 | } | |
2821 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
2822 | p->csums_alg, "csums-alg"); | |
2823 | if (IS_ERR(csums_tfm)) { | |
2824 | csums_tfm = NULL; | |
2825 | goto disconnect; | |
2826 | } | |
2827 | } | |
2828 | ||
8e26f9cc PR |
2829 | if (apv > 94) { |
2830 | mdev->sync_conf.rate = be32_to_cpu(p->rate); | |
2831 | mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); | |
2832 | mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); | |
2833 | mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); | |
2834 | mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d PR |
2835 | |
2836 | fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; | |
2837 | if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { | |
2838 | rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); | |
2839 | if (!rs_plan_s) { | |
2840 | dev_err(DEV, "kmalloc of fifo_buffer failed"); | |
2841 | goto disconnect; | |
2842 | } | |
2843 | } | |
8e26f9cc | 2844 | } |
b411b363 PR |
2845 | |
2846 | spin_lock(&mdev->peer_seq_lock); | |
2847 | /* lock against drbd_nl_syncer_conf() */ | |
2848 | if (verify_tfm) { | |
2849 | strcpy(mdev->sync_conf.verify_alg, p->verify_alg); | |
2850 | mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; | |
2851 | crypto_free_hash(mdev->verify_tfm); | |
2852 | mdev->verify_tfm = verify_tfm; | |
2853 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); | |
2854 | } | |
2855 | if (csums_tfm) { | |
2856 | strcpy(mdev->sync_conf.csums_alg, p->csums_alg); | |
2857 | mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; | |
2858 | crypto_free_hash(mdev->csums_tfm); | |
2859 | mdev->csums_tfm = csums_tfm; | |
2860 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); | |
2861 | } | |
778f271d PR |
2862 | if (fifo_size != mdev->rs_plan_s.size) { |
2863 | kfree(mdev->rs_plan_s.values); | |
2864 | mdev->rs_plan_s.values = rs_plan_s; | |
2865 | mdev->rs_plan_s.size = fifo_size; | |
2866 | mdev->rs_planed = 0; | |
2867 | } | |
b411b363 PR |
2868 | spin_unlock(&mdev->peer_seq_lock); |
2869 | } | |
2870 | ||
2871 | return ok; | |
2872 | disconnect: | |
2873 | /* just for completeness: actually not needed, | |
2874 | * as this is not reached if csums_tfm was ok. */ | |
2875 | crypto_free_hash(csums_tfm); | |
2876 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
2877 | crypto_free_hash(verify_tfm); | |
2878 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2879 | return FALSE; | |
2880 | } | |
2881 | ||
2882 | static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) | |
2883 | { | |
2884 | /* sorry, we currently have no working implementation | |
2885 | * of distributed TCQ */ | |
2886 | } | |
2887 | ||
2888 | /* warn if the arguments differ by more than 12.5% */ | |
2889 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
2890 | const char *s, sector_t a, sector_t b) | |
2891 | { | |
2892 | sector_t d; | |
2893 | if (a == 0 || b == 0) | |
2894 | return; | |
2895 | d = (a > b) ? (a - b) : (b - a); | |
2896 | if (d > (a>>3) || d > (b>>3)) | |
2897 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
2898 | (unsigned long long)a, (unsigned long long)b); | |
2899 | } | |
2900 | ||
02918be2 | 2901 | static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 2902 | { |
02918be2 | 2903 | struct p_sizes *p = &mdev->data.rbuf.sizes; |
b411b363 PR |
2904 | enum determine_dev_size dd = unchanged; |
2905 | unsigned int max_seg_s; | |
2906 | sector_t p_size, p_usize, my_usize; | |
2907 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 2908 | enum dds_flags ddsf; |
b411b363 | 2909 | |
b411b363 PR |
2910 | p_size = be64_to_cpu(p->d_size); |
2911 | p_usize = be64_to_cpu(p->u_size); | |
2912 | ||
2913 | if (p_size == 0 && mdev->state.disk == D_DISKLESS) { | |
2914 | dev_err(DEV, "some backing storage is needed\n"); | |
2915 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2916 | return FALSE; | |
2917 | } | |
2918 | ||
2919 | /* just store the peer's disk size for now. | |
2920 | * we still need to figure out whether we accept that. */ | |
2921 | mdev->p_size = p_size; | |
2922 | ||
b411b363 PR |
2923 | if (get_ldev(mdev)) { |
2924 | warn_if_differ_considerably(mdev, "lower level device sizes", | |
2925 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
2926 | warn_if_differ_considerably(mdev, "user requested size", | |
2927 | p_usize, mdev->ldev->dc.disk_size); | |
2928 | ||
2929 | /* if this is the first connect, or an otherwise expected | |
2930 | * param exchange, choose the minimum */ | |
2931 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
2932 | p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, | |
2933 | p_usize); | |
2934 | ||
2935 | my_usize = mdev->ldev->dc.disk_size; | |
2936 | ||
2937 | if (mdev->ldev->dc.disk_size != p_usize) { | |
2938 | mdev->ldev->dc.disk_size = p_usize; | |
2939 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
2940 | (unsigned long)mdev->ldev->dc.disk_size); | |
2941 | } | |
2942 | ||
2943 | /* Never shrink a device with usable data during connect. | |
2944 | But allow online shrinking if we are connected. */ | |
a393db6f | 2945 | if (drbd_new_dev_size(mdev, mdev->ldev, 0) < |
b411b363 PR |
2946 | drbd_get_capacity(mdev->this_bdev) && |
2947 | mdev->state.disk >= D_OUTDATED && | |
2948 | mdev->state.conn < C_CONNECTED) { | |
2949 | dev_err(DEV, "The peer's disk size is too small!\n"); | |
2950 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2951 | mdev->ldev->dc.disk_size = my_usize; | |
2952 | put_ldev(mdev); | |
2953 | return FALSE; | |
2954 | } | |
2955 | put_ldev(mdev); | |
2956 | } | |
2957 | #undef min_not_zero | |
2958 | ||
e89b591c | 2959 | ddsf = be16_to_cpu(p->dds_flags); |
b411b363 | 2960 | if (get_ldev(mdev)) { |
e89b591c | 2961 | dd = drbd_determin_dev_size(mdev, ddsf); |
b411b363 PR |
2962 | put_ldev(mdev); |
2963 | if (dd == dev_size_error) | |
2964 | return FALSE; | |
2965 | drbd_md_sync(mdev); | |
2966 | } else { | |
2967 | /* I am diskless, need to accept the peer's size. */ | |
2968 | drbd_set_my_capacity(mdev, p_size); | |
2969 | } | |
2970 | ||
b411b363 PR |
2971 | if (get_ldev(mdev)) { |
2972 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
2973 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
2974 | ldsc = 1; | |
2975 | } | |
2976 | ||
a1c88d0d LE |
2977 | if (mdev->agreed_pro_version < 94) |
2978 | max_seg_s = be32_to_cpu(p->max_segment_size); | |
8979d9c9 LE |
2979 | else if (mdev->agreed_pro_version == 94) |
2980 | max_seg_s = DRBD_MAX_SIZE_H80_PACKET; | |
a1c88d0d LE |
2981 | else /* drbd 8.3.8 onwards */ |
2982 | max_seg_s = DRBD_MAX_SEGMENT_SIZE; | |
2983 | ||
b411b363 PR |
2984 | if (max_seg_s != queue_max_segment_size(mdev->rq_queue)) |
2985 | drbd_setup_queue_param(mdev, max_seg_s); | |
2986 | ||
e89b591c | 2987 | drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type)); |
b411b363 PR |
2988 | put_ldev(mdev); |
2989 | } | |
2990 | ||
2991 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
2992 | if (be64_to_cpu(p->c_size) != | |
2993 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
2994 | /* we have different sizes, probably peer | |
2995 | * needs to know my new size... */ | |
e89b591c | 2996 | drbd_send_sizes(mdev, 0, ddsf); |
b411b363 PR |
2997 | } |
2998 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
2999 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
3000 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
e89b591c PR |
3001 | mdev->state.disk >= D_INCONSISTENT) { |
3002 | if (ddsf & DDSF_NO_RESYNC) | |
3003 | dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); | |
3004 | else | |
3005 | resync_after_online_grow(mdev); | |
3006 | } else | |
b411b363 PR |
3007 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
3008 | } | |
3009 | } | |
3010 | ||
3011 | return TRUE; | |
3012 | } | |
3013 | ||
02918be2 | 3014 | static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 3015 | { |
02918be2 | 3016 | struct p_uuids *p = &mdev->data.rbuf.uuids; |
b411b363 PR |
3017 | u64 *p_uuid; |
3018 | int i; | |
3019 | ||
b411b363 PR |
3020 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
3021 | ||
3022 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3023 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3024 | ||
3025 | kfree(mdev->p_uuid); | |
3026 | mdev->p_uuid = p_uuid; | |
3027 | ||
3028 | if (mdev->state.conn < C_CONNECTED && | |
3029 | mdev->state.disk < D_INCONSISTENT && | |
3030 | mdev->state.role == R_PRIMARY && | |
3031 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
3032 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
3033 | (unsigned long long)mdev->ed_uuid); | |
3034 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3035 | return FALSE; | |
3036 | } | |
3037 | ||
3038 | if (get_ldev(mdev)) { | |
3039 | int skip_initial_sync = | |
3040 | mdev->state.conn == C_CONNECTED && | |
3041 | mdev->agreed_pro_version >= 90 && | |
3042 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && | |
3043 | (p_uuid[UI_FLAGS] & 8); | |
3044 | if (skip_initial_sync) { | |
3045 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3046 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
3047 | "clear_n_write from receive_uuids"); | |
3048 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); | |
3049 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3050 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3051 | CS_VERBOSE, NULL); | |
3052 | drbd_md_sync(mdev); | |
3053 | } | |
3054 | put_ldev(mdev); | |
18a50fa2 PR |
3055 | } else if (mdev->state.disk < D_INCONSISTENT && |
3056 | mdev->state.role == R_PRIMARY) { | |
3057 | /* I am a diskless primary, the peer just created a new current UUID | |
3058 | for me. */ | |
3059 | drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); | |
b411b363 PR |
3060 | } |
3061 | ||
3062 | /* Before we test for the disk state, we should wait until an eventually | |
3063 | ongoing cluster wide state change is finished. That is important if | |
3064 | we are primary and are detaching from our disk. We need to see the | |
3065 | new disk state... */ | |
3066 | wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); | |
3067 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) | |
3068 | drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); | |
3069 | ||
3070 | return TRUE; | |
3071 | } | |
3072 | ||
3073 | /** | |
3074 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3075 | * @ps: The state as seen by the peer. | |
3076 | */ | |
3077 | static union drbd_state convert_state(union drbd_state ps) | |
3078 | { | |
3079 | union drbd_state ms; | |
3080 | ||
3081 | static enum drbd_conns c_tab[] = { | |
3082 | [C_CONNECTED] = C_CONNECTED, | |
3083 | ||
3084 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3085 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3086 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3087 | [C_VERIFY_S] = C_VERIFY_T, | |
3088 | [C_MASK] = C_MASK, | |
3089 | }; | |
3090 | ||
3091 | ms.i = ps.i; | |
3092 | ||
3093 | ms.conn = c_tab[ps.conn]; | |
3094 | ms.peer = ps.role; | |
3095 | ms.role = ps.peer; | |
3096 | ms.pdsk = ps.disk; | |
3097 | ms.disk = ps.pdsk; | |
3098 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3099 | ||
3100 | return ms; | |
3101 | } | |
3102 | ||
02918be2 | 3103 | static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 3104 | { |
02918be2 | 3105 | struct p_req_state *p = &mdev->data.rbuf.req_state; |
b411b363 PR |
3106 | union drbd_state mask, val; |
3107 | int rv; | |
3108 | ||
b411b363 PR |
3109 | mask.i = be32_to_cpu(p->mask); |
3110 | val.i = be32_to_cpu(p->val); | |
3111 | ||
3112 | if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && | |
3113 | test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { | |
3114 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); | |
3115 | return TRUE; | |
3116 | } | |
3117 | ||
3118 | mask = convert_state(mask); | |
3119 | val = convert_state(val); | |
3120 | ||
3121 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); | |
3122 | ||
3123 | drbd_send_sr_reply(mdev, rv); | |
3124 | drbd_md_sync(mdev); | |
3125 | ||
3126 | return TRUE; | |
3127 | } | |
3128 | ||
02918be2 | 3129 | static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 3130 | { |
02918be2 | 3131 | struct p_state *p = &mdev->data.rbuf.state; |
4ac4aada | 3132 | union drbd_state os, ns, peer_state; |
b411b363 | 3133 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 3134 | enum chg_state_flags cs_flags; |
b411b363 PR |
3135 | int rv; |
3136 | ||
b411b363 PR |
3137 | peer_state.i = be32_to_cpu(p->state); |
3138 | ||
3139 | real_peer_disk = peer_state.disk; | |
3140 | if (peer_state.disk == D_NEGOTIATING) { | |
3141 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3142 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3143 | } | |
3144 | ||
3145 | spin_lock_irq(&mdev->req_lock); | |
3146 | retry: | |
4ac4aada | 3147 | os = ns = mdev->state; |
b411b363 PR |
3148 | spin_unlock_irq(&mdev->req_lock); |
3149 | ||
e9ef7bb6 LE |
3150 | /* peer says his disk is uptodate, while we think it is inconsistent, |
3151 | * and this happens while we think we have a sync going on. */ | |
3152 | if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && | |
3153 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { | |
3154 | /* If we are (becoming) SyncSource, but peer is still in sync | |
3155 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
3156 | * will change to inconsistent once the peer reaches active | |
3157 | * syncing states. | |
3158 | * It may have changed syncer-paused flags, however, so we | |
3159 | * cannot ignore this completely. */ | |
3160 | if (peer_state.conn > C_CONNECTED && | |
3161 | peer_state.conn < C_SYNC_SOURCE) | |
3162 | real_peer_disk = D_INCONSISTENT; | |
3163 | ||
3164 | /* if peer_state changes to connected at the same time, | |
3165 | * it explicitly notifies us that it finished resync. | |
3166 | * Maybe we should finish it up, too? */ | |
3167 | else if (os.conn >= C_SYNC_SOURCE && | |
3168 | peer_state.conn == C_CONNECTED) { | |
3169 | if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) | |
3170 | drbd_resync_finished(mdev); | |
3171 | return TRUE; | |
3172 | } | |
3173 | } | |
3174 | ||
3175 | /* peer says his disk is inconsistent, while we think it is uptodate, | |
3176 | * and this happens while the peer still thinks we have a sync going on, | |
3177 | * but we think we are already done with the sync. | |
3178 | * We ignore this to avoid flapping pdsk. | |
3179 | * This should not happen, if the peer is a recent version of drbd. */ | |
3180 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
3181 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
3182 | real_peer_disk = D_UP_TO_DATE; | |
3183 | ||
4ac4aada LE |
3184 | if (ns.conn == C_WF_REPORT_PARAMS) |
3185 | ns.conn = C_CONNECTED; | |
b411b363 PR |
3186 | |
3187 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && | |
3188 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3189 | int cr; /* consider resync */ | |
3190 | ||
3191 | /* if we established a new connection */ | |
4ac4aada | 3192 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
3193 | /* if we had an established connection |
3194 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 3195 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 3196 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 3197 | os.disk == D_NEGOTIATING)); |
b411b363 PR |
3198 | /* if we have both been inconsistent, and the peer has been |
3199 | * forced to be UpToDate with --overwrite-data */ | |
3200 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3201 | /* if we had been plain connected, and the admin requested to | |
3202 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 3203 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
3204 | (peer_state.conn >= C_STARTING_SYNC_S && |
3205 | peer_state.conn <= C_WF_BITMAP_T)); | |
3206 | ||
3207 | if (cr) | |
4ac4aada | 3208 | ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); |
b411b363 PR |
3209 | |
3210 | put_ldev(mdev); | |
4ac4aada LE |
3211 | if (ns.conn == C_MASK) { |
3212 | ns.conn = C_CONNECTED; | |
b411b363 | 3213 | if (mdev->state.disk == D_NEGOTIATING) { |
82f59cc6 | 3214 | drbd_force_state(mdev, NS(disk, D_FAILED)); |
b411b363 PR |
3215 | } else if (peer_state.disk == D_NEGOTIATING) { |
3216 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3217 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3218 | real_peer_disk = D_DISKLESS; |
b411b363 | 3219 | } else { |
cf14c2e9 PR |
3220 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) |
3221 | return FALSE; | |
4ac4aada | 3222 | D_ASSERT(os.conn == C_WF_REPORT_PARAMS); |
b411b363 PR |
3223 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); |
3224 | return FALSE; | |
3225 | } | |
3226 | } | |
3227 | } | |
3228 | ||
3229 | spin_lock_irq(&mdev->req_lock); | |
4ac4aada | 3230 | if (mdev->state.i != os.i) |
b411b363 PR |
3231 | goto retry; |
3232 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
b411b363 PR |
3233 | ns.peer = peer_state.role; |
3234 | ns.pdsk = real_peer_disk; | |
3235 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 3236 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b411b363 | 3237 | ns.disk = mdev->new_state_tmp.disk; |
4ac4aada LE |
3238 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
3239 | if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && | |
481c6f50 PR |
3240 | test_bit(NEW_CUR_UUID, &mdev->flags)) { |
3241 | /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this | |
3242 | for temporal network outages! */ | |
3243 | spin_unlock_irq(&mdev->req_lock); | |
3244 | dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); | |
3245 | tl_clear(mdev); | |
3246 | drbd_uuid_new_current(mdev); | |
3247 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
3248 | drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); | |
3249 | return FALSE; | |
3250 | } | |
65d922c3 | 3251 | rv = _drbd_set_state(mdev, ns, cs_flags, NULL); |
b411b363 PR |
3252 | ns = mdev->state; |
3253 | spin_unlock_irq(&mdev->req_lock); | |
3254 | ||
3255 | if (rv < SS_SUCCESS) { | |
3256 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3257 | return FALSE; | |
3258 | } | |
3259 | ||
4ac4aada LE |
3260 | if (os.conn > C_WF_REPORT_PARAMS) { |
3261 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
3262 | peer_state.disk != D_NEGOTIATING ) { |
3263 | /* we want resync, peer has not yet decided to sync... */ | |
3264 | /* Nowadays only used when forcing a node into primary role and | |
3265 | setting its disk to UpToDate with that */ | |
3266 | drbd_send_uuids(mdev); | |
3267 | drbd_send_state(mdev); | |
3268 | } | |
3269 | } | |
3270 | ||
3271 | mdev->net_conf->want_lose = 0; | |
3272 | ||
3273 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3274 | ||
3275 | return TRUE; | |
3276 | } | |
3277 | ||
02918be2 | 3278 | static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 | 3279 | { |
02918be2 | 3280 | struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid; |
b411b363 PR |
3281 | |
3282 | wait_event(mdev->misc_wait, | |
3283 | mdev->state.conn == C_WF_SYNC_UUID || | |
3284 | mdev->state.conn < C_CONNECTED || | |
3285 | mdev->state.disk < D_NEGOTIATING); | |
3286 | ||
3287 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
3288 | ||
b411b363 PR |
3289 | /* Here the _drbd_uuid_ functions are right, current should |
3290 | _not_ be rotated into the history */ | |
3291 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3292 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
3293 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
3294 | ||
3295 | drbd_start_resync(mdev, C_SYNC_TARGET); | |
3296 | ||
3297 | put_ldev(mdev); | |
3298 | } else | |
3299 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
3300 | ||
3301 | return TRUE; | |
3302 | } | |
3303 | ||
3304 | enum receive_bitmap_ret { OK, DONE, FAILED }; | |
3305 | ||
3306 | static enum receive_bitmap_ret | |
02918be2 PR |
3307 | receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, |
3308 | unsigned long *buffer, struct bm_xfer_ctx *c) | |
b411b363 PR |
3309 | { |
3310 | unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); | |
3311 | unsigned want = num_words * sizeof(long); | |
3312 | ||
02918be2 PR |
3313 | if (want != data_size) { |
3314 | dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); | |
b411b363 PR |
3315 | return FAILED; |
3316 | } | |
3317 | if (want == 0) | |
3318 | return DONE; | |
3319 | if (drbd_recv(mdev, buffer, want) != want) | |
3320 | return FAILED; | |
3321 | ||
3322 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); | |
3323 | ||
3324 | c->word_offset += num_words; | |
3325 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
3326 | if (c->bit_offset > c->bm_bits) | |
3327 | c->bit_offset = c->bm_bits; | |
3328 | ||
3329 | return OK; | |
3330 | } | |
3331 | ||
3332 | static enum receive_bitmap_ret | |
3333 | recv_bm_rle_bits(struct drbd_conf *mdev, | |
3334 | struct p_compressed_bm *p, | |
3335 | struct bm_xfer_ctx *c) | |
3336 | { | |
3337 | struct bitstream bs; | |
3338 | u64 look_ahead; | |
3339 | u64 rl; | |
3340 | u64 tmp; | |
3341 | unsigned long s = c->bit_offset; | |
3342 | unsigned long e; | |
004352fa | 3343 | int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head)); |
b411b363 PR |
3344 | int toggle = DCBP_get_start(p); |
3345 | int have; | |
3346 | int bits; | |
3347 | ||
3348 | bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); | |
3349 | ||
3350 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
3351 | if (bits < 0) | |
3352 | return FAILED; | |
3353 | ||
3354 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
3355 | bits = vli_decode_bits(&rl, look_ahead); | |
3356 | if (bits <= 0) | |
3357 | return FAILED; | |
3358 | ||
3359 | if (toggle) { | |
3360 | e = s + rl -1; | |
3361 | if (e >= c->bm_bits) { | |
3362 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
3363 | return FAILED; | |
3364 | } | |
3365 | _drbd_bm_set_bits(mdev, s, e); | |
3366 | } | |
3367 | ||
3368 | if (have < bits) { | |
3369 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
3370 | have, bits, look_ahead, | |
3371 | (unsigned int)(bs.cur.b - p->code), | |
3372 | (unsigned int)bs.buf_len); | |
3373 | return FAILED; | |
3374 | } | |
3375 | look_ahead >>= bits; | |
3376 | have -= bits; | |
3377 | ||
3378 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
3379 | if (bits < 0) | |
3380 | return FAILED; | |
3381 | look_ahead |= tmp << have; | |
3382 | have += bits; | |
3383 | } | |
3384 | ||
3385 | c->bit_offset = s; | |
3386 | bm_xfer_ctx_bit_to_word_offset(c); | |
3387 | ||
3388 | return (s == c->bm_bits) ? DONE : OK; | |
3389 | } | |
3390 | ||
3391 | static enum receive_bitmap_ret | |
3392 | decode_bitmap_c(struct drbd_conf *mdev, | |
3393 | struct p_compressed_bm *p, | |
3394 | struct bm_xfer_ctx *c) | |
3395 | { | |
3396 | if (DCBP_get_code(p) == RLE_VLI_Bits) | |
3397 | return recv_bm_rle_bits(mdev, p, c); | |
3398 | ||
3399 | /* other variants had been implemented for evaluation, | |
3400 | * but have been dropped as this one turned out to be "best" | |
3401 | * during all our tests. */ | |
3402 | ||
3403 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
3404 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3405 | return FAILED; | |
3406 | } | |
3407 | ||
3408 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
3409 | const char *direction, struct bm_xfer_ctx *c) | |
3410 | { | |
3411 | /* what would it take to transfer it "plaintext" */ | |
0b70a13d | 3412 | unsigned plain = sizeof(struct p_header80) * |
b411b363 PR |
3413 | ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) |
3414 | + c->bm_words * sizeof(long); | |
3415 | unsigned total = c->bytes[0] + c->bytes[1]; | |
3416 | unsigned r; | |
3417 | ||
3418 | /* total can not be zero. but just in case: */ | |
3419 | if (total == 0) | |
3420 | return; | |
3421 | ||
3422 | /* don't report if not compressed */ | |
3423 | if (total >= plain) | |
3424 | return; | |
3425 | ||
3426 | /* total < plain. check for overflow, still */ | |
3427 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
3428 | : (1000 * total / plain); | |
3429 | ||
3430 | if (r > 1000) | |
3431 | r = 1000; | |
3432 | ||
3433 | r = 1000 - r; | |
3434 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
3435 | "total %u; compression: %u.%u%%\n", | |
3436 | direction, | |
3437 | c->bytes[1], c->packets[1], | |
3438 | c->bytes[0], c->packets[0], | |
3439 | total, r/10, r % 10); | |
3440 | } | |
3441 | ||
3442 | /* Since we are processing the bitfield from lower addresses to higher, | |
3443 | it does not matter if the process it in 32 bit chunks or 64 bit | |
3444 | chunks as long as it is little endian. (Understand it as byte stream, | |
3445 | beginning with the lowest byte...) If we would use big endian | |
3446 | we would need to process it from the highest address to the lowest, | |
3447 | in order to be agnostic to the 32 vs 64 bits issue. | |
3448 | ||
3449 | returns 0 on failure, 1 if we successfully received it. */ | |
02918be2 | 3450 | static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 PR |
3451 | { |
3452 | struct bm_xfer_ctx c; | |
3453 | void *buffer; | |
3454 | enum receive_bitmap_ret ret; | |
3455 | int ok = FALSE; | |
02918be2 | 3456 | struct p_header80 *h = &mdev->data.rbuf.header.h80; |
b411b363 PR |
3457 | |
3458 | wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); | |
3459 | ||
3460 | drbd_bm_lock(mdev, "receive bitmap"); | |
3461 | ||
3462 | /* maybe we should use some per thread scratch page, | |
3463 | * and allocate that during initial device creation? */ | |
3464 | buffer = (unsigned long *) __get_free_page(GFP_NOIO); | |
3465 | if (!buffer) { | |
3466 | dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); | |
3467 | goto out; | |
3468 | } | |
3469 | ||
3470 | c = (struct bm_xfer_ctx) { | |
3471 | .bm_bits = drbd_bm_bits(mdev), | |
3472 | .bm_words = drbd_bm_words(mdev), | |
3473 | }; | |
3474 | ||
3475 | do { | |
02918be2 PR |
3476 | if (cmd == P_BITMAP) { |
3477 | ret = receive_bitmap_plain(mdev, data_size, buffer, &c); | |
3478 | } else if (cmd == P_COMPRESSED_BITMAP) { | |
b411b363 PR |
3479 | /* MAYBE: sanity check that we speak proto >= 90, |
3480 | * and the feature is enabled! */ | |
3481 | struct p_compressed_bm *p; | |
3482 | ||
02918be2 | 3483 | if (data_size > BM_PACKET_PAYLOAD_BYTES) { |
b411b363 PR |
3484 | dev_err(DEV, "ReportCBitmap packet too large\n"); |
3485 | goto out; | |
3486 | } | |
3487 | /* use the page buff */ | |
3488 | p = buffer; | |
3489 | memcpy(p, h, sizeof(*h)); | |
02918be2 | 3490 | if (drbd_recv(mdev, p->head.payload, data_size) != data_size) |
b411b363 | 3491 | goto out; |
004352fa LE |
3492 | if (data_size <= (sizeof(*p) - sizeof(p->head))) { |
3493 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); | |
b411b363 PR |
3494 | return FAILED; |
3495 | } | |
3496 | ret = decode_bitmap_c(mdev, p, &c); | |
3497 | } else { | |
02918be2 | 3498 | dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); |
b411b363 PR |
3499 | goto out; |
3500 | } | |
3501 | ||
02918be2 PR |
3502 | c.packets[cmd == P_BITMAP]++; |
3503 | c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size; | |
b411b363 PR |
3504 | |
3505 | if (ret != OK) | |
3506 | break; | |
3507 | ||
02918be2 | 3508 | if (!drbd_recv_header(mdev, &cmd, &data_size)) |
b411b363 PR |
3509 | goto out; |
3510 | } while (ret == OK); | |
3511 | if (ret == FAILED) | |
3512 | goto out; | |
3513 | ||
3514 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
3515 | ||
3516 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
3517 | ok = !drbd_send_bitmap(mdev); | |
3518 | if (!ok) | |
3519 | goto out; | |
3520 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
3521 | ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
3522 | D_ASSERT(ok == SS_SUCCESS); | |
3523 | } else if (mdev->state.conn != C_WF_BITMAP_S) { | |
3524 | /* admin may have requested C_DISCONNECTING, | |
3525 | * other threads may have noticed network errors */ | |
3526 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
3527 | drbd_conn_str(mdev->state.conn)); | |
3528 | } | |
3529 | ||
3530 | ok = TRUE; | |
3531 | out: | |
3532 | drbd_bm_unlock(mdev); | |
3533 | if (ok && mdev->state.conn == C_WF_BITMAP_S) | |
3534 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
3535 | free_page((unsigned long) buffer); | |
3536 | return ok; | |
3537 | } | |
3538 | ||
02918be2 | 3539 | static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
b411b363 PR |
3540 | { |
3541 | /* TODO zero copy sink :) */ | |
3542 | static char sink[128]; | |
3543 | int size, want, r; | |
3544 | ||
02918be2 PR |
3545 | dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", |
3546 | cmd, data_size); | |
b411b363 | 3547 | |
02918be2 | 3548 | size = data_size; |
b411b363 PR |
3549 | while (size > 0) { |
3550 | want = min_t(int, size, sizeof(sink)); | |
3551 | r = drbd_recv(mdev, sink, want); | |
3552 | ERR_IF(r <= 0) break; | |
3553 | size -= r; | |
3554 | } | |
3555 | return size == 0; | |
3556 | } | |
3557 | ||
02918be2 | 3558 | static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) |
0ced55a3 | 3559 | { |
e7f52dfb LE |
3560 | if (mdev->state.disk >= D_INCONSISTENT) |
3561 | drbd_kick_lo(mdev); | |
0ced55a3 | 3562 | |
e7f52dfb LE |
3563 | /* Make sure we've acked all the TCP data associated |
3564 | * with the data requests being unplugged */ | |
3565 | drbd_tcp_quickack(mdev->data.socket); | |
0ced55a3 | 3566 | |
0ced55a3 PR |
3567 | return TRUE; |
3568 | } | |
3569 | ||
02918be2 PR |
3570 | typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive); |
3571 | ||
3572 | struct data_cmd { | |
3573 | int expect_payload; | |
3574 | size_t pkt_size; | |
3575 | drbd_cmd_handler_f function; | |
3576 | }; | |
3577 | ||
3578 | static struct data_cmd drbd_cmd_handler[] = { | |
3579 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, | |
3580 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
3581 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
3582 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
3583 | [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , | |
3584 | [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } , | |
3585 | [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote }, | |
3586 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
3587 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
3588 | [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam }, | |
3589 | [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam }, | |
3590 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, | |
3591 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
3592 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
3593 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
3594 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
3595 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
3596 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
3597 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
3598 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
3599 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, | |
b411b363 PR |
3600 | /* anything missing from this table is in |
3601 | * the asender_tbl, see get_asender_cmd */ | |
02918be2 | 3602 | [P_MAX_CMD] = { 0, 0, NULL }, |
b411b363 PR |
3603 | }; |
3604 | ||
02918be2 PR |
3605 | /* All handler functions that expect a sub-header get that sub-heder in |
3606 | mdev->data.rbuf.header.head.payload. | |
3607 | ||
3608 | Usually in mdev->data.rbuf.header.head the callback can find the usual | |
3609 | p_header, but they may not rely on that. Since there is also p_header95 ! | |
3610 | */ | |
b411b363 PR |
3611 | |
3612 | static void drbdd(struct drbd_conf *mdev) | |
3613 | { | |
02918be2 PR |
3614 | union p_header *header = &mdev->data.rbuf.header; |
3615 | unsigned int packet_size; | |
3616 | enum drbd_packets cmd; | |
3617 | size_t shs; /* sub header size */ | |
3618 | int rv; | |
b411b363 PR |
3619 | |
3620 | while (get_t_state(&mdev->receiver) == Running) { | |
3621 | drbd_thread_current_set_cpu(mdev); | |
02918be2 PR |
3622 | if (!drbd_recv_header(mdev, &cmd, &packet_size)) |
3623 | goto err_out; | |
b411b363 | 3624 | |
02918be2 PR |
3625 | if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { |
3626 | dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); | |
3627 | goto err_out; | |
0b33a916 | 3628 | } |
b411b363 | 3629 | |
02918be2 PR |
3630 | shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header); |
3631 | rv = drbd_recv(mdev, &header->h80.payload, shs); | |
3632 | if (unlikely(rv != shs)) { | |
3633 | dev_err(DEV, "short read while reading sub header: rv=%d\n", rv); | |
3634 | goto err_out; | |
b411b363 | 3635 | } |
b411b363 | 3636 | |
02918be2 PR |
3637 | if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { |
3638 | dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); | |
3639 | goto err_out; | |
b411b363 | 3640 | } |
b411b363 | 3641 | |
02918be2 | 3642 | rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); |
b411b363 | 3643 | |
02918be2 | 3644 | if (unlikely(!rv)) { |
b411b363 | 3645 | dev_err(DEV, "error receiving %s, l: %d!\n", |
02918be2 PR |
3646 | cmdname(cmd), packet_size); |
3647 | goto err_out; | |
b411b363 PR |
3648 | } |
3649 | } | |
b411b363 | 3650 | |
02918be2 PR |
3651 | if (0) { |
3652 | err_out: | |
3653 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3654 | } | |
856c50c7 LE |
3655 | /* If we leave here, we probably want to update at least the |
3656 | * "Connected" indicator on stable storage. Do so explicitly here. */ | |
3657 | drbd_md_sync(mdev); | |
b411b363 PR |
3658 | } |
3659 | ||
3660 | void drbd_flush_workqueue(struct drbd_conf *mdev) | |
3661 | { | |
3662 | struct drbd_wq_barrier barr; | |
3663 | ||
3664 | barr.w.cb = w_prev_work_done; | |
3665 | init_completion(&barr.done); | |
3666 | drbd_queue_work(&mdev->data.work, &barr.w); | |
3667 | wait_for_completion(&barr.done); | |
3668 | } | |
3669 | ||
f70b3511 PR |
3670 | void drbd_free_tl_hash(struct drbd_conf *mdev) |
3671 | { | |
3672 | struct hlist_head *h; | |
3673 | ||
3674 | spin_lock_irq(&mdev->req_lock); | |
3675 | ||
3676 | if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) { | |
3677 | spin_unlock_irq(&mdev->req_lock); | |
3678 | return; | |
3679 | } | |
3680 | /* paranoia code */ | |
3681 | for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) | |
3682 | if (h->first) | |
3683 | dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", | |
3684 | (int)(h - mdev->ee_hash), h->first); | |
3685 | kfree(mdev->ee_hash); | |
3686 | mdev->ee_hash = NULL; | |
3687 | mdev->ee_hash_s = 0; | |
3688 | ||
3689 | /* paranoia code */ | |
3690 | for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) | |
3691 | if (h->first) | |
3692 | dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", | |
3693 | (int)(h - mdev->tl_hash), h->first); | |
3694 | kfree(mdev->tl_hash); | |
3695 | mdev->tl_hash = NULL; | |
3696 | mdev->tl_hash_s = 0; | |
3697 | spin_unlock_irq(&mdev->req_lock); | |
3698 | } | |
3699 | ||
b411b363 PR |
3700 | static void drbd_disconnect(struct drbd_conf *mdev) |
3701 | { | |
3702 | enum drbd_fencing_p fp; | |
3703 | union drbd_state os, ns; | |
3704 | int rv = SS_UNKNOWN_ERROR; | |
3705 | unsigned int i; | |
3706 | ||
3707 | if (mdev->state.conn == C_STANDALONE) | |
3708 | return; | |
3709 | if (mdev->state.conn >= C_WF_CONNECTION) | |
3710 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", | |
3711 | drbd_conn_str(mdev->state.conn)); | |
3712 | ||
3713 | /* asender does not clean up anything. it must not interfere, either */ | |
3714 | drbd_thread_stop(&mdev->asender); | |
b411b363 | 3715 | drbd_free_sock(mdev); |
b411b363 | 3716 | |
85719573 | 3717 | /* wait for current activity to cease. */ |
b411b363 PR |
3718 | spin_lock_irq(&mdev->req_lock); |
3719 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
3720 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
3721 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
3722 | spin_unlock_irq(&mdev->req_lock); | |
3723 | ||
3724 | /* We do not have data structures that would allow us to | |
3725 | * get the rs_pending_cnt down to 0 again. | |
3726 | * * On C_SYNC_TARGET we do not have any data structures describing | |
3727 | * the pending RSDataRequest's we have sent. | |
3728 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
3729 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
3730 | * And no, it is not the sum of the reference counts in the | |
3731 | * resync_LRU. The resync_LRU tracks the whole operation including | |
3732 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
3733 | * on the fly. */ | |
3734 | drbd_rs_cancel_all(mdev); | |
3735 | mdev->rs_total = 0; | |
3736 | mdev->rs_failed = 0; | |
3737 | atomic_set(&mdev->rs_pending_cnt, 0); | |
3738 | wake_up(&mdev->misc_wait); | |
3739 | ||
3740 | /* make sure syncer is stopped and w_resume_next_sg queued */ | |
3741 | del_timer_sync(&mdev->resync_timer); | |
b411b363 PR |
3742 | resync_timer_fn((unsigned long)mdev); |
3743 | ||
b411b363 PR |
3744 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
3745 | * w_make_resync_request etc. which may still be on the worker queue | |
3746 | * to be "canceled" */ | |
3747 | drbd_flush_workqueue(mdev); | |
3748 | ||
3749 | /* This also does reclaim_net_ee(). If we do this too early, we might | |
3750 | * miss some resync ee and pages.*/ | |
3751 | drbd_process_done_ee(mdev); | |
3752 | ||
3753 | kfree(mdev->p_uuid); | |
3754 | mdev->p_uuid = NULL; | |
3755 | ||
fb22c402 | 3756 | if (!is_susp(mdev->state)) |
b411b363 PR |
3757 | tl_clear(mdev); |
3758 | ||
b411b363 PR |
3759 | dev_info(DEV, "Connection closed\n"); |
3760 | ||
3761 | drbd_md_sync(mdev); | |
3762 | ||
3763 | fp = FP_DONT_CARE; | |
3764 | if (get_ldev(mdev)) { | |
3765 | fp = mdev->ldev->dc.fencing; | |
3766 | put_ldev(mdev); | |
3767 | } | |
3768 | ||
87f7be4c PR |
3769 | if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) |
3770 | drbd_try_outdate_peer_async(mdev); | |
b411b363 PR |
3771 | |
3772 | spin_lock_irq(&mdev->req_lock); | |
3773 | os = mdev->state; | |
3774 | if (os.conn >= C_UNCONNECTED) { | |
3775 | /* Do not restart in case we are C_DISCONNECTING */ | |
3776 | ns = os; | |
3777 | ns.conn = C_UNCONNECTED; | |
3778 | rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
3779 | } | |
3780 | spin_unlock_irq(&mdev->req_lock); | |
3781 | ||
3782 | if (os.conn == C_DISCONNECTING) { | |
84dfb9f5 | 3783 | wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0); |
b411b363 | 3784 | |
fb22c402 | 3785 | if (!is_susp(mdev->state)) { |
f70b3511 PR |
3786 | /* we must not free the tl_hash |
3787 | * while application io is still on the fly */ | |
3788 | wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); | |
3789 | drbd_free_tl_hash(mdev); | |
3790 | } | |
b411b363 PR |
3791 | |
3792 | crypto_free_hash(mdev->cram_hmac_tfm); | |
3793 | mdev->cram_hmac_tfm = NULL; | |
3794 | ||
3795 | kfree(mdev->net_conf); | |
3796 | mdev->net_conf = NULL; | |
3797 | drbd_request_state(mdev, NS(conn, C_STANDALONE)); | |
3798 | } | |
3799 | ||
3800 | /* tcp_close and release of sendpage pages can be deferred. I don't | |
3801 | * want to use SO_LINGER, because apparently it can be deferred for | |
3802 | * more than 20 seconds (longest time I checked). | |
3803 | * | |
3804 | * Actually we don't care for exactly when the network stack does its | |
3805 | * put_page(), but release our reference on these pages right here. | |
3806 | */ | |
3807 | i = drbd_release_ee(mdev, &mdev->net_ee); | |
3808 | if (i) | |
3809 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
435f0740 LE |
3810 | i = atomic_read(&mdev->pp_in_use_by_net); |
3811 | if (i) | |
3812 | dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); | |
b411b363 PR |
3813 | i = atomic_read(&mdev->pp_in_use); |
3814 | if (i) | |
45bb912b | 3815 | dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
b411b363 PR |
3816 | |
3817 | D_ASSERT(list_empty(&mdev->read_ee)); | |
3818 | D_ASSERT(list_empty(&mdev->active_ee)); | |
3819 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
3820 | D_ASSERT(list_empty(&mdev->done_ee)); | |
3821 | ||
3822 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
3823 | atomic_set(&mdev->current_epoch->epoch_size, 0); | |
3824 | D_ASSERT(list_empty(&mdev->current_epoch->list)); | |
3825 | } | |
3826 | ||
3827 | /* | |
3828 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
3829 | * we can agree on is stored in agreed_pro_version. | |
3830 | * | |
3831 | * feature flags and the reserved array should be enough room for future | |
3832 | * enhancements of the handshake protocol, and possible plugins... | |
3833 | * | |
3834 | * for now, they are expected to be zero, but ignored. | |
3835 | */ | |
3836 | static int drbd_send_handshake(struct drbd_conf *mdev) | |
3837 | { | |
3838 | /* ASSERT current == mdev->receiver ... */ | |
3839 | struct p_handshake *p = &mdev->data.sbuf.handshake; | |
3840 | int ok; | |
3841 | ||
3842 | if (mutex_lock_interruptible(&mdev->data.mutex)) { | |
3843 | dev_err(DEV, "interrupted during initial handshake\n"); | |
3844 | return 0; /* interrupted. not ok. */ | |
3845 | } | |
3846 | ||
3847 | if (mdev->data.socket == NULL) { | |
3848 | mutex_unlock(&mdev->data.mutex); | |
3849 | return 0; | |
3850 | } | |
3851 | ||
3852 | memset(p, 0, sizeof(*p)); | |
3853 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
3854 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
3855 | ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, | |
0b70a13d | 3856 | (struct p_header80 *)p, sizeof(*p), 0 ); |
b411b363 PR |
3857 | mutex_unlock(&mdev->data.mutex); |
3858 | return ok; | |
3859 | } | |
3860 | ||
3861 | /* | |
3862 | * return values: | |
3863 | * 1 yes, we have a valid connection | |
3864 | * 0 oops, did not work out, please try again | |
3865 | * -1 peer talks different language, | |
3866 | * no point in trying again, please go standalone. | |
3867 | */ | |
3868 | static int drbd_do_handshake(struct drbd_conf *mdev) | |
3869 | { | |
3870 | /* ASSERT current == mdev->receiver ... */ | |
3871 | struct p_handshake *p = &mdev->data.rbuf.handshake; | |
02918be2 PR |
3872 | const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); |
3873 | unsigned int length; | |
3874 | enum drbd_packets cmd; | |
b411b363 PR |
3875 | int rv; |
3876 | ||
3877 | rv = drbd_send_handshake(mdev); | |
3878 | if (!rv) | |
3879 | return 0; | |
3880 | ||
02918be2 | 3881 | rv = drbd_recv_header(mdev, &cmd, &length); |
b411b363 PR |
3882 | if (!rv) |
3883 | return 0; | |
3884 | ||
02918be2 | 3885 | if (cmd != P_HAND_SHAKE) { |
b411b363 | 3886 | dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", |
02918be2 | 3887 | cmdname(cmd), cmd); |
b411b363 PR |
3888 | return -1; |
3889 | } | |
3890 | ||
02918be2 | 3891 | if (length != expect) { |
b411b363 | 3892 | dev_err(DEV, "expected HandShake length: %u, received: %u\n", |
02918be2 | 3893 | expect, length); |
b411b363 PR |
3894 | return -1; |
3895 | } | |
3896 | ||
3897 | rv = drbd_recv(mdev, &p->head.payload, expect); | |
3898 | ||
3899 | if (rv != expect) { | |
3900 | dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); | |
3901 | return 0; | |
3902 | } | |
3903 | ||
b411b363 PR |
3904 | p->protocol_min = be32_to_cpu(p->protocol_min); |
3905 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
3906 | if (p->protocol_max == 0) | |
3907 | p->protocol_max = p->protocol_min; | |
3908 | ||
3909 | if (PRO_VERSION_MAX < p->protocol_min || | |
3910 | PRO_VERSION_MIN > p->protocol_max) | |
3911 | goto incompat; | |
3912 | ||
3913 | mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); | |
3914 | ||
3915 | dev_info(DEV, "Handshake successful: " | |
3916 | "Agreed network protocol version %d\n", mdev->agreed_pro_version); | |
3917 | ||
3918 | return 1; | |
3919 | ||
3920 | incompat: | |
3921 | dev_err(DEV, "incompatible DRBD dialects: " | |
3922 | "I support %d-%d, peer supports %d-%d\n", | |
3923 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
3924 | p->protocol_min, p->protocol_max); | |
3925 | return -1; | |
3926 | } | |
3927 | ||
3928 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
3929 | static int drbd_do_auth(struct drbd_conf *mdev) | |
3930 | { | |
3931 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
3932 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 3933 | return -1; |
b411b363 PR |
3934 | } |
3935 | #else | |
3936 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
3937 | |
3938 | /* Return value: | |
3939 | 1 - auth succeeded, | |
3940 | 0 - failed, try again (network error), | |
3941 | -1 - auth failed, don't try again. | |
3942 | */ | |
3943 | ||
b411b363 PR |
3944 | static int drbd_do_auth(struct drbd_conf *mdev) |
3945 | { | |
3946 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ | |
3947 | struct scatterlist sg; | |
3948 | char *response = NULL; | |
3949 | char *right_response = NULL; | |
3950 | char *peers_ch = NULL; | |
b411b363 PR |
3951 | unsigned int key_len = strlen(mdev->net_conf->shared_secret); |
3952 | unsigned int resp_size; | |
3953 | struct hash_desc desc; | |
02918be2 PR |
3954 | enum drbd_packets cmd; |
3955 | unsigned int length; | |
b411b363 PR |
3956 | int rv; |
3957 | ||
3958 | desc.tfm = mdev->cram_hmac_tfm; | |
3959 | desc.flags = 0; | |
3960 | ||
3961 | rv = crypto_hash_setkey(mdev->cram_hmac_tfm, | |
3962 | (u8 *)mdev->net_conf->shared_secret, key_len); | |
3963 | if (rv) { | |
3964 | dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); | |
b10d96cb | 3965 | rv = -1; |
b411b363 PR |
3966 | goto fail; |
3967 | } | |
3968 | ||
3969 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
3970 | ||
3971 | rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); | |
3972 | if (!rv) | |
3973 | goto fail; | |
3974 | ||
02918be2 | 3975 | rv = drbd_recv_header(mdev, &cmd, &length); |
b411b363 PR |
3976 | if (!rv) |
3977 | goto fail; | |
3978 | ||
02918be2 | 3979 | if (cmd != P_AUTH_CHALLENGE) { |
b411b363 | 3980 | dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
02918be2 | 3981 | cmdname(cmd), cmd); |
b411b363 PR |
3982 | rv = 0; |
3983 | goto fail; | |
3984 | } | |
3985 | ||
02918be2 | 3986 | if (length > CHALLENGE_LEN * 2) { |
b411b363 | 3987 | dev_err(DEV, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 3988 | rv = -1; |
b411b363 PR |
3989 | goto fail; |
3990 | } | |
3991 | ||
02918be2 | 3992 | peers_ch = kmalloc(length, GFP_NOIO); |
b411b363 PR |
3993 | if (peers_ch == NULL) { |
3994 | dev_err(DEV, "kmalloc of peers_ch failed\n"); | |
b10d96cb | 3995 | rv = -1; |
b411b363 PR |
3996 | goto fail; |
3997 | } | |
3998 | ||
02918be2 | 3999 | rv = drbd_recv(mdev, peers_ch, length); |
b411b363 | 4000 | |
02918be2 | 4001 | if (rv != length) { |
b411b363 PR |
4002 | dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); |
4003 | rv = 0; | |
4004 | goto fail; | |
4005 | } | |
4006 | ||
4007 | resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); | |
4008 | response = kmalloc(resp_size, GFP_NOIO); | |
4009 | if (response == NULL) { | |
4010 | dev_err(DEV, "kmalloc of response failed\n"); | |
b10d96cb | 4011 | rv = -1; |
b411b363 PR |
4012 | goto fail; |
4013 | } | |
4014 | ||
4015 | sg_init_table(&sg, 1); | |
02918be2 | 4016 | sg_set_buf(&sg, peers_ch, length); |
b411b363 PR |
4017 | |
4018 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4019 | if (rv) { | |
4020 | dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); | |
b10d96cb | 4021 | rv = -1; |
b411b363 PR |
4022 | goto fail; |
4023 | } | |
4024 | ||
4025 | rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); | |
4026 | if (!rv) | |
4027 | goto fail; | |
4028 | ||
02918be2 | 4029 | rv = drbd_recv_header(mdev, &cmd, &length); |
b411b363 PR |
4030 | if (!rv) |
4031 | goto fail; | |
4032 | ||
02918be2 | 4033 | if (cmd != P_AUTH_RESPONSE) { |
b411b363 | 4034 | dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", |
02918be2 | 4035 | cmdname(cmd), cmd); |
b411b363 PR |
4036 | rv = 0; |
4037 | goto fail; | |
4038 | } | |
4039 | ||
02918be2 | 4040 | if (length != resp_size) { |
b411b363 PR |
4041 | dev_err(DEV, "expected AuthResponse payload of wrong size\n"); |
4042 | rv = 0; | |
4043 | goto fail; | |
4044 | } | |
4045 | ||
4046 | rv = drbd_recv(mdev, response , resp_size); | |
4047 | ||
4048 | if (rv != resp_size) { | |
4049 | dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); | |
4050 | rv = 0; | |
4051 | goto fail; | |
4052 | } | |
4053 | ||
4054 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4055 | if (right_response == NULL) { |
b411b363 | 4056 | dev_err(DEV, "kmalloc of right_response failed\n"); |
b10d96cb | 4057 | rv = -1; |
b411b363 PR |
4058 | goto fail; |
4059 | } | |
4060 | ||
4061 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4062 | ||
4063 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4064 | if (rv) { | |
4065 | dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); | |
b10d96cb | 4066 | rv = -1; |
b411b363 PR |
4067 | goto fail; |
4068 | } | |
4069 | ||
4070 | rv = !memcmp(response, right_response, resp_size); | |
4071 | ||
4072 | if (rv) | |
4073 | dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", | |
4074 | resp_size, mdev->net_conf->cram_hmac_alg); | |
b10d96cb JT |
4075 | else |
4076 | rv = -1; | |
b411b363 PR |
4077 | |
4078 | fail: | |
4079 | kfree(peers_ch); | |
4080 | kfree(response); | |
4081 | kfree(right_response); | |
4082 | ||
4083 | return rv; | |
4084 | } | |
4085 | #endif | |
4086 | ||
4087 | int drbdd_init(struct drbd_thread *thi) | |
4088 | { | |
4089 | struct drbd_conf *mdev = thi->mdev; | |
4090 | unsigned int minor = mdev_to_minor(mdev); | |
4091 | int h; | |
4092 | ||
4093 | sprintf(current->comm, "drbd%d_receiver", minor); | |
4094 | ||
4095 | dev_info(DEV, "receiver (re)started\n"); | |
4096 | ||
4097 | do { | |
4098 | h = drbd_connect(mdev); | |
4099 | if (h == 0) { | |
4100 | drbd_disconnect(mdev); | |
4101 | __set_current_state(TASK_INTERRUPTIBLE); | |
4102 | schedule_timeout(HZ); | |
4103 | } | |
4104 | if (h == -1) { | |
4105 | dev_warn(DEV, "Discarding network configuration.\n"); | |
4106 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
4107 | } | |
4108 | } while (h == 0); | |
4109 | ||
4110 | if (h > 0) { | |
4111 | if (get_net_conf(mdev)) { | |
4112 | drbdd(mdev); | |
4113 | put_net_conf(mdev); | |
4114 | } | |
4115 | } | |
4116 | ||
4117 | drbd_disconnect(mdev); | |
4118 | ||
4119 | dev_info(DEV, "receiver terminated\n"); | |
4120 | return 0; | |
4121 | } | |
4122 | ||
4123 | /* ********* acknowledge sender ******** */ | |
4124 | ||
0b70a13d | 4125 | static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4126 | { |
4127 | struct p_req_state_reply *p = (struct p_req_state_reply *)h; | |
4128 | ||
4129 | int retcode = be32_to_cpu(p->retcode); | |
4130 | ||
4131 | if (retcode >= SS_SUCCESS) { | |
4132 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4133 | } else { | |
4134 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4135 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4136 | drbd_set_st_err_str(retcode), retcode); | |
4137 | } | |
4138 | wake_up(&mdev->state_wait); | |
4139 | ||
4140 | return TRUE; | |
4141 | } | |
4142 | ||
0b70a13d | 4143 | static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4144 | { |
4145 | return drbd_send_ping_ack(mdev); | |
4146 | ||
4147 | } | |
4148 | ||
0b70a13d | 4149 | static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4150 | { |
4151 | /* restore idle timeout */ | |
4152 | mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; | |
309d1608 PR |
4153 | if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) |
4154 | wake_up(&mdev->misc_wait); | |
b411b363 PR |
4155 | |
4156 | return TRUE; | |
4157 | } | |
4158 | ||
0b70a13d | 4159 | static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4160 | { |
4161 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4162 | sector_t sector = be64_to_cpu(p->sector); | |
4163 | int blksize = be32_to_cpu(p->blksize); | |
4164 | ||
4165 | D_ASSERT(mdev->agreed_pro_version >= 89); | |
4166 | ||
4167 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4168 | ||
1d53f09e LE |
4169 | if (get_ldev(mdev)) { |
4170 | drbd_rs_complete_io(mdev, sector); | |
4171 | drbd_set_in_sync(mdev, sector, blksize); | |
4172 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4173 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4174 | put_ldev(mdev); | |
4175 | } | |
b411b363 | 4176 | dec_rs_pending(mdev); |
778f271d | 4177 | atomic_add(blksize >> 9, &mdev->rs_sect_in); |
b411b363 PR |
4178 | |
4179 | return TRUE; | |
4180 | } | |
4181 | ||
4182 | /* when we receive the ACK for a write request, | |
4183 | * verify that we actually know about it */ | |
4184 | static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, | |
4185 | u64 id, sector_t sector) | |
4186 | { | |
4187 | struct hlist_head *slot = tl_hash_slot(mdev, sector); | |
4188 | struct hlist_node *n; | |
4189 | struct drbd_request *req; | |
4190 | ||
4191 | hlist_for_each_entry(req, n, slot, colision) { | |
4192 | if ((unsigned long)req == (unsigned long)id) { | |
4193 | if (req->sector != sector) { | |
4194 | dev_err(DEV, "_ack_id_to_req: found req %p but it has " | |
4195 | "wrong sector (%llus versus %llus)\n", req, | |
4196 | (unsigned long long)req->sector, | |
4197 | (unsigned long long)sector); | |
4198 | break; | |
4199 | } | |
4200 | return req; | |
4201 | } | |
4202 | } | |
4203 | dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", | |
4204 | (void *)(unsigned long)id, (unsigned long long)sector); | |
4205 | return NULL; | |
4206 | } | |
4207 | ||
4208 | typedef struct drbd_request *(req_validator_fn) | |
4209 | (struct drbd_conf *mdev, u64 id, sector_t sector); | |
4210 | ||
4211 | static int validate_req_change_req_state(struct drbd_conf *mdev, | |
4212 | u64 id, sector_t sector, req_validator_fn validator, | |
4213 | const char *func, enum drbd_req_event what) | |
4214 | { | |
4215 | struct drbd_request *req; | |
4216 | struct bio_and_error m; | |
4217 | ||
4218 | spin_lock_irq(&mdev->req_lock); | |
4219 | req = validator(mdev, id, sector); | |
4220 | if (unlikely(!req)) { | |
4221 | spin_unlock_irq(&mdev->req_lock); | |
4222 | dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); | |
4223 | return FALSE; | |
4224 | } | |
4225 | __req_mod(req, what, &m); | |
4226 | spin_unlock_irq(&mdev->req_lock); | |
4227 | ||
4228 | if (m.bio) | |
4229 | complete_master_bio(mdev, &m); | |
4230 | return TRUE; | |
4231 | } | |
4232 | ||
0b70a13d | 4233 | static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4234 | { |
4235 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4236 | sector_t sector = be64_to_cpu(p->sector); | |
4237 | int blksize = be32_to_cpu(p->blksize); | |
4238 | enum drbd_req_event what; | |
4239 | ||
4240 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4241 | ||
4242 | if (is_syncer_block_id(p->block_id)) { | |
4243 | drbd_set_in_sync(mdev, sector, blksize); | |
4244 | dec_rs_pending(mdev); | |
4245 | return TRUE; | |
4246 | } | |
4247 | switch (be16_to_cpu(h->command)) { | |
4248 | case P_RS_WRITE_ACK: | |
4249 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4250 | what = write_acked_by_peer_and_sis; | |
4251 | break; | |
4252 | case P_WRITE_ACK: | |
4253 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4254 | what = write_acked_by_peer; | |
4255 | break; | |
4256 | case P_RECV_ACK: | |
4257 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); | |
4258 | what = recv_acked_by_peer; | |
4259 | break; | |
4260 | case P_DISCARD_ACK: | |
4261 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4262 | what = conflict_discarded_by_peer; | |
4263 | break; | |
4264 | default: | |
4265 | D_ASSERT(0); | |
4266 | return FALSE; | |
4267 | } | |
4268 | ||
4269 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4270 | _ack_id_to_req, __func__ , what); | |
4271 | } | |
4272 | ||
0b70a13d | 4273 | static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4274 | { |
4275 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4276 | sector_t sector = be64_to_cpu(p->sector); | |
4277 | ||
4278 | if (__ratelimit(&drbd_ratelimit_state)) | |
4279 | dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); | |
4280 | ||
4281 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4282 | ||
4283 | if (is_syncer_block_id(p->block_id)) { | |
4284 | int size = be32_to_cpu(p->blksize); | |
4285 | dec_rs_pending(mdev); | |
4286 | drbd_rs_failed_io(mdev, sector, size); | |
4287 | return TRUE; | |
4288 | } | |
4289 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4290 | _ack_id_to_req, __func__ , neg_acked); | |
4291 | } | |
4292 | ||
0b70a13d | 4293 | static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4294 | { |
4295 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4296 | sector_t sector = be64_to_cpu(p->sector); | |
4297 | ||
4298 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4299 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", | |
4300 | (unsigned long long)sector, be32_to_cpu(p->blksize)); | |
4301 | ||
4302 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4303 | _ar_id_to_req, __func__ , neg_acked); | |
4304 | } | |
4305 | ||
0b70a13d | 4306 | static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4307 | { |
4308 | sector_t sector; | |
4309 | int size; | |
4310 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4311 | ||
4312 | sector = be64_to_cpu(p->sector); | |
4313 | size = be32_to_cpu(p->blksize); | |
b411b363 PR |
4314 | |
4315 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4316 | ||
4317 | dec_rs_pending(mdev); | |
4318 | ||
4319 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
4320 | drbd_rs_complete_io(mdev, sector); | |
4321 | drbd_rs_failed_io(mdev, sector, size); | |
4322 | put_ldev(mdev); | |
4323 | } | |
4324 | ||
4325 | return TRUE; | |
4326 | } | |
4327 | ||
0b70a13d | 4328 | static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4329 | { |
4330 | struct p_barrier_ack *p = (struct p_barrier_ack *)h; | |
4331 | ||
4332 | tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); | |
4333 | ||
4334 | return TRUE; | |
4335 | } | |
4336 | ||
0b70a13d | 4337 | static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h) |
b411b363 PR |
4338 | { |
4339 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4340 | struct drbd_work *w; | |
4341 | sector_t sector; | |
4342 | int size; | |
4343 | ||
4344 | sector = be64_to_cpu(p->sector); | |
4345 | size = be32_to_cpu(p->blksize); | |
4346 | ||
4347 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4348 | ||
4349 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
4350 | drbd_ov_oos_found(mdev, sector, size); | |
4351 | else | |
4352 | ov_oos_print(mdev); | |
4353 | ||
1d53f09e LE |
4354 | if (!get_ldev(mdev)) |
4355 | return TRUE; | |
4356 | ||
b411b363 PR |
4357 | drbd_rs_complete_io(mdev, sector); |
4358 | dec_rs_pending(mdev); | |
4359 | ||
4360 | if (--mdev->ov_left == 0) { | |
4361 | w = kmalloc(sizeof(*w), GFP_NOIO); | |
4362 | if (w) { | |
4363 | w->cb = w_ov_finished; | |
4364 | drbd_queue_work_front(&mdev->data.work, w); | |
4365 | } else { | |
4366 | dev_err(DEV, "kmalloc(w) failed."); | |
4367 | ov_oos_print(mdev); | |
4368 | drbd_resync_finished(mdev); | |
4369 | } | |
4370 | } | |
1d53f09e | 4371 | put_ldev(mdev); |
b411b363 PR |
4372 | return TRUE; |
4373 | } | |
4374 | ||
02918be2 | 4375 | static int got_skip(struct drbd_conf *mdev, struct p_header80 *h) |
0ced55a3 | 4376 | { |
0ced55a3 PR |
4377 | return TRUE; |
4378 | } | |
4379 | ||
b411b363 PR |
4380 | struct asender_cmd { |
4381 | size_t pkt_size; | |
0b70a13d | 4382 | int (*process)(struct drbd_conf *mdev, struct p_header80 *h); |
b411b363 PR |
4383 | }; |
4384 | ||
4385 | static struct asender_cmd *get_asender_cmd(int cmd) | |
4386 | { | |
4387 | static struct asender_cmd asender_tbl[] = { | |
4388 | /* anything missing from this table is in | |
4389 | * the drbd_cmd_handler (drbd_default_handler) table, | |
4390 | * see the beginning of drbdd() */ | |
0b70a13d PR |
4391 | [P_PING] = { sizeof(struct p_header80), got_Ping }, |
4392 | [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck }, | |
b411b363 PR |
4393 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
4394 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4395 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4396 | [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4397 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
4398 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
4399 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, | |
4400 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
4401 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
4402 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
4403 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
02918be2 | 4404 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, |
b411b363 PR |
4405 | [P_MAX_CMD] = { 0, NULL }, |
4406 | }; | |
4407 | if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) | |
4408 | return NULL; | |
4409 | return &asender_tbl[cmd]; | |
4410 | } | |
4411 | ||
4412 | int drbd_asender(struct drbd_thread *thi) | |
4413 | { | |
4414 | struct drbd_conf *mdev = thi->mdev; | |
02918be2 | 4415 | struct p_header80 *h = &mdev->meta.rbuf.header.h80; |
b411b363 PR |
4416 | struct asender_cmd *cmd = NULL; |
4417 | ||
4418 | int rv, len; | |
4419 | void *buf = h; | |
4420 | int received = 0; | |
0b70a13d | 4421 | int expect = sizeof(struct p_header80); |
b411b363 PR |
4422 | int empty; |
4423 | ||
4424 | sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); | |
4425 | ||
4426 | current->policy = SCHED_RR; /* Make this a realtime task! */ | |
4427 | current->rt_priority = 2; /* more important than all other tasks */ | |
4428 | ||
4429 | while (get_t_state(thi) == Running) { | |
4430 | drbd_thread_current_set_cpu(mdev); | |
4431 | if (test_and_clear_bit(SEND_PING, &mdev->flags)) { | |
4432 | ERR_IF(!drbd_send_ping(mdev)) goto reconnect; | |
4433 | mdev->meta.socket->sk->sk_rcvtimeo = | |
4434 | mdev->net_conf->ping_timeo*HZ/10; | |
4435 | } | |
4436 | ||
4437 | /* conditionally cork; | |
4438 | * it may hurt latency if we cork without much to send */ | |
4439 | if (!mdev->net_conf->no_cork && | |
4440 | 3 < atomic_read(&mdev->unacked_cnt)) | |
4441 | drbd_tcp_cork(mdev->meta.socket); | |
4442 | while (1) { | |
4443 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4444 | flush_signals(current); | |
0f8488e1 | 4445 | if (!drbd_process_done_ee(mdev)) |
b411b363 | 4446 | goto reconnect; |
b411b363 PR |
4447 | /* to avoid race with newly queued ACKs */ |
4448 | set_bit(SIGNAL_ASENDER, &mdev->flags); | |
4449 | spin_lock_irq(&mdev->req_lock); | |
4450 | empty = list_empty(&mdev->done_ee); | |
4451 | spin_unlock_irq(&mdev->req_lock); | |
4452 | /* new ack may have been queued right here, | |
4453 | * but then there is also a signal pending, | |
4454 | * and we start over... */ | |
4455 | if (empty) | |
4456 | break; | |
4457 | } | |
4458 | /* but unconditionally uncork unless disabled */ | |
4459 | if (!mdev->net_conf->no_cork) | |
4460 | drbd_tcp_uncork(mdev->meta.socket); | |
4461 | ||
4462 | /* short circuit, recv_msg would return EINTR anyways. */ | |
4463 | if (signal_pending(current)) | |
4464 | continue; | |
4465 | ||
4466 | rv = drbd_recv_short(mdev, mdev->meta.socket, | |
4467 | buf, expect-received, 0); | |
4468 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4469 | ||
4470 | flush_signals(current); | |
4471 | ||
4472 | /* Note: | |
4473 | * -EINTR (on meta) we got a signal | |
4474 | * -EAGAIN (on meta) rcvtimeo expired | |
4475 | * -ECONNRESET other side closed the connection | |
4476 | * -ERESTARTSYS (on data) we got a signal | |
4477 | * rv < 0 other than above: unexpected error! | |
4478 | * rv == expected: full header or command | |
4479 | * rv < expected: "woken" by signal during receive | |
4480 | * rv == 0 : "connection shut down by peer" | |
4481 | */ | |
4482 | if (likely(rv > 0)) { | |
4483 | received += rv; | |
4484 | buf += rv; | |
4485 | } else if (rv == 0) { | |
4486 | dev_err(DEV, "meta connection shut down by peer.\n"); | |
4487 | goto reconnect; | |
4488 | } else if (rv == -EAGAIN) { | |
4489 | if (mdev->meta.socket->sk->sk_rcvtimeo == | |
4490 | mdev->net_conf->ping_timeo*HZ/10) { | |
4491 | dev_err(DEV, "PingAck did not arrive in time.\n"); | |
4492 | goto reconnect; | |
4493 | } | |
4494 | set_bit(SEND_PING, &mdev->flags); | |
4495 | continue; | |
4496 | } else if (rv == -EINTR) { | |
4497 | continue; | |
4498 | } else { | |
4499 | dev_err(DEV, "sock_recvmsg returned %d\n", rv); | |
4500 | goto reconnect; | |
4501 | } | |
4502 | ||
4503 | if (received == expect && cmd == NULL) { | |
4504 | if (unlikely(h->magic != BE_DRBD_MAGIC)) { | |
004352fa LE |
4505 | dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n", |
4506 | be32_to_cpu(h->magic), | |
4507 | be16_to_cpu(h->command), | |
4508 | be16_to_cpu(h->length)); | |
b411b363 PR |
4509 | goto reconnect; |
4510 | } | |
4511 | cmd = get_asender_cmd(be16_to_cpu(h->command)); | |
4512 | len = be16_to_cpu(h->length); | |
4513 | if (unlikely(cmd == NULL)) { | |
004352fa LE |
4514 | dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n", |
4515 | be32_to_cpu(h->magic), | |
4516 | be16_to_cpu(h->command), | |
4517 | be16_to_cpu(h->length)); | |
b411b363 PR |
4518 | goto disconnect; |
4519 | } | |
4520 | expect = cmd->pkt_size; | |
0b70a13d | 4521 | ERR_IF(len != expect-sizeof(struct p_header80)) |
b411b363 | 4522 | goto reconnect; |
b411b363 PR |
4523 | } |
4524 | if (received == expect) { | |
4525 | D_ASSERT(cmd != NULL); | |
b411b363 PR |
4526 | if (!cmd->process(mdev, h)) |
4527 | goto reconnect; | |
4528 | ||
4529 | buf = h; | |
4530 | received = 0; | |
0b70a13d | 4531 | expect = sizeof(struct p_header80); |
b411b363 PR |
4532 | cmd = NULL; |
4533 | } | |
4534 | } | |
4535 | ||
4536 | if (0) { | |
4537 | reconnect: | |
4538 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
856c50c7 | 4539 | drbd_md_sync(mdev); |
b411b363 PR |
4540 | } |
4541 | if (0) { | |
4542 | disconnect: | |
4543 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
856c50c7 | 4544 | drbd_md_sync(mdev); |
b411b363 PR |
4545 | } |
4546 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4547 | ||
4548 | D_ASSERT(mdev->state.conn < C_CONNECTED); | |
4549 | dev_info(DEV, "asender terminated\n"); | |
4550 | ||
4551 | return 0; | |
4552 | } |